Alternatives to Alinto

KumoMTA, a high-performance and highly flexible sending platform, is available under an Open Source license for high-volume email users looking to replace PowerMTA, Momentum, or traditional Open Source MTAs.

Experience secure, enterprise-level email, calendar, and collaboration tools without breaking the bank. Kerio Connect offers a comprehensive suite of features and capabilities for messaging and collaboration without the intricacies and hefty costs associated with other platforms. It seamlessly integrates email with shared calendars, scheduling, contact management, tasks, notes, shared and public folders, and instant messaging. You can synchronize your messages directly to your preferred mobile devices using Microsoft ActiveSync. The Instant Messaging feature is compatible with XMPP, allowing use with various third-party chat and IM applications on both desktop and mobile devices. Installation of Kerio Connect takes just 10 minutes, with users able to start working within an additional 10 minutes. This solution can be deployed either on-premises or through partner-hosted cloud environments, accommodating users on Mac, Windows, or Linux systems. Furthermore, it provides comprehensive support for Outlook on both Windows and Mac, as well as numerous other IMAP or POP-compliant email clients, ensuring versatility and ease of integration for all users.

Enhance your productivity with a business-class email and calendaring solution. With Exchange, you can effectively collaborate on essential documents while enjoying a streamlined inbox that highlights significant messages and adjusts to your individual work habits, allowing you to accomplish tasks more efficiently. Benefit from a customized inbox filled with useful features, along with a more structured method for managing and engaging with your emails. Enhanced search functions deliver quicker and more comprehensive results, and the inclusion of Add-ins provides powerful customization options that link you to contemporary services and internal business applications. Additionally, optimize your schedule with a sophisticated calendaring system that surpasses mere appointment setting, automatically capturing details from emails like flight confirmations and hotel bookings, and offering venue suggestions based on your current location. Microsoft Exchange Online serves as a robust hosted email platform designed for businesses, ensuring the protection of your data through advanced security measures. With these tools combined, you can streamline your workflow and empower your team to work more innovatively.

XgenPlus is the most advanced enterprise email solution. Communicate and collaborate with it. It is the first IDN Email Server to provide EAI (Email Address Interization), i.e Linguistic Email Address, like (Email address written in Hindi). It is an email management software that can be used by any enterprise, SME, PSU, or government. department. It supports all the basic features like POP, IMAP and webmail, calendars, contacts, SMS, scheduling and security. Key Features IDN Email - The only internationalized domain name email hosting server Policy for auto archival and mail retention Merge / de-merge email account Group Mail with a Tracking Report Broadcast email Schedule Email / SMS & Other... Benefits: Reliable - 99.99% uptime Scalable: Flexible to meet the needs of your organization Robust Security: Inbuilt Antispam software Live Chat, On-Call, and Offline Support Available 24x7 Easy Data & Administrative Control Better Storage

MDaemon Email Server supports IMAP and SMTP protocols. It delivers solid performance thanks to its feature-rich, user-friendly design. The email server software is low in total cost of ownership (TCO), and is specifically designed to meet the needs small- to medium-sized businesses. MDaemon supports multiple languages, content filtering, and multiple domains. It also offers flexible administration and an open standard design.

Experience secure and private email, calendars, and additional features, all at no cost and utilizing Free & Open Source Software (FOSS). We prioritize open standards and formats for every aspect of storage and communication, ensuring no vendor lock-in occurs. Your data is kept secure under Swiss jurisdiction, and will never be shared with third parties without your explicit permission. Our services comply with GDPR, HIPAA, and PCI regulations, and are built with security as a top priority from the very beginning. We offer perfect forward secrecy (PFS) and provide end-to-end encryption options, with no back doors present. Our comprehensive documentation addresses many commonly asked questions and more. If you're in search of an immediate answer or a swift solution, our Knowledgebase is an excellent resource. For any inquiries or issues that remain unresolved in the documentation, you can always reach out to our support team for assistance. We are committed to ensuring your experience is both safe and satisfactory.

Mailtraq Professional mail server software serves as a comprehensive solution for businesses seeking efficient email management. It delivers all necessary functionalities at an affordable cost, eliminating common complications associated with email servers. As a perfect alternative to Microsoft Exchange, Mailtraq is user-friendly to deploy and straightforward to oversee. With attractive licensing fees, no server client access licenses (CALs), and reliable performance, Mailtraq is the go-to choice for small to medium-sized businesses and home offices. Email plays a crucial role in the operations of any organization, and the security of stored messages is essential for the sustained success of your company. Although managing your own email server can involve some level of complexity and costs, it provides you with total physical control over who accesses your email communications. In contrast, utilizing your internet service provider's email service raises privacy concerns, as their administrators can access and read your messages. Likewise, relying on a software-as-a-service (SaaS) provider for hosted email solutions means you may not only be unaware of who is accessing your emails but also lack information about the physical location of your data storage. Therefore, opting for Mailtraq ensures both control and peace of mind regarding your email integrity and confidentiality.

As a business on the rise, maintaining strong connections is essential, and that means you definitely need email services. However, managing daily operational hurdles can be overwhelming, and that's where we come in. You're in the perfect place for assistance. GMS has been a trusted name since the dawn of email, bringing a wealth of experience in catering to customer needs. We understand your challenges because we share your commitment to your business. Our approach is straightforward: we avoid complex jargon and strive for clarity. With GMS, you receive the perfect email solution tailored for small enterprises, along with comprehensive support. Transitioning to the Cloud means businesses and individuals can eliminate concerns about power needs, physical space, or software upgrades. With cloud computing, the burden of physical storage and ongoing maintenance is lifted, resulting in a markedly lower total cost of ownership. Ultimately, this shift empowers you to focus more on your business and less on IT concerns.

There is no office. That is the only rule. TeamChat for project teamwork, business email, TeamChat to collaborate on office documents, and online meetings. All this and more in our secure cloud at half the cost. Chat in groups organized around projects, upload files and mention coworkers. Comment on emails posted by others. Pin important posts. Integration with email allows you to share received messages directly into TeamChat room to catch the attention of colleagues. Desktop Client and Desktop Office documents for Windows and Linux will help you increase your office productivity. You can choose to purchase the entire Suite or just the apps you need.

Oracle Communications Messaging Server is an Internet messaging solution built on standards, aimed at providing robust and high-capacity message handling for both service providers and their end-users. This versatile Messaging Server accommodates various email protocols and is capable of managing a wide array of content types, including embedded text, audio, graphics, video files, and other formats. Its design ensures reliability and efficiency in message delivery, making it a preferred choice for organizations seeking effective communication tools.

MailEnable offers a comprehensive solution for secure email and collaboration services, gaining recognition in a recent independent survey as the leading Windows Mail Server Platform globally. Whether you are a large hosting provider catering to numerous users or a small business managing a single domain, MailEnable delivers a solution that is sure to satisfy your email users. The Windows Mail Server software from MailEnable boasts features that rival those of Microsoft Exchange, including robust messaging protocols like Exchange ActiveSync, IMAP, SMTP, and POP3, along with collaborative tools such as calendaring (CalDAV), contacts (CardDAV), tasks, and notes. This extensive feature set ensures that users have access to everything they need for seamless communication and organization.

Provide your clients with reliable, enterprise-grade email hosting alongside a range of additional services. This outstanding option caters to service providers and is adaptable for a user base ranging from thousands to millions. Attract more clients by presenting a top-tier email server solution renowned for its flexibility, seamlessly integrating with your current systems. You can oversee your email, coordinate and share calendars, and synchronize your mobile devices, all supported by a robust and secure mail server. This solution is ideal for organizations of any scale. Axigen possesses extensive expertise; explore its diverse functionalities and select the ones that align with your needs. Effortlessly manage your emails while enhancing productivity with tools for calendars, tasks, and notes. Experience user-friendly browser functionality with features like keyboard shortcuts, drag-and-drop capabilities, real-time email viewing, frequently accessed folders, customizable email filters, vacation replies, and personal blacklist/whitelist options, ensuring a comprehensive email management experience. With such a versatile system, businesses can streamline their communication effectively.

Citadel offers email, collaboration, groupware, and content management solutions that can be quickly deployed on your own servers or in the cloud. With its unique room-based architecture, Citadel is not only user-friendly but also highly adaptable and robust. Unlike any other platform, it successfully integrates a wide range of features while maintaining a familiar and cohesive interface. This software is entirely open source, distributed under the GNU General Public License, ensuring users access the full version without limitations or cost. You can download the most advanced version available here, and the best part is that it’s all provided at no charge. This makes Citadel an exceptional choice for those seeking powerful and comprehensive software solutions without the financial burden often associated with enterprise editions.

Enhance your Outlook experience through features like push email, personal information management, group scheduling, availability services, public folders, delegation, and additional functionalities. By utilizing fewer servers and attractive subscription models, you can boost your profit margins effectively. Furthermore, cut down on licensing expenses while capitalizing on your team's current expertise by adopting a Linux-based system. Scalix offers starter packs that serve as comprehensive, single-server messaging solutions tailored for smaller enterprises and organizations, delivering a complete suite of email and collaboration tools. The Scalix small business edition is specifically crafted for small enterprises, providing a rich array of business capabilities, including the ability to quickly recover deleted user-specific items, support for mobile devices, and various other essential features. This solution not only facilitates efficient communication but also empowers businesses to operate seamlessly in a competitive landscape.

The COVID-19 pandemic has significantly transformed our daily lives and work environments. With the increase in remote work, there has emerged a pressing demand for enhanced communication, collaboration, and adaptability. OpenText™ FirstClass® serves as a robust collaboration platform that facilitates teamwork, boosts communication, and allows easy access to people and information from any mobile device, ensuring that team members stay connected across the organization. As a comprehensive solution, FirstClass is not only cost-effective but also flexible and user-friendly. It empowers both individuals and teams to collaborate effectively toward shared objectives, fostering a collective sense of purpose and introducing innovative methods of engagement. Specifically designed for collaboration, FirstClass provides secure communication, mobile accessibility, customization options, seamless integration with other applications, and dependable archiving, making it an essential tool for any organization navigating the complexities of modern work. Additionally, its user-friendly interface and comprehensive features contribute to a more streamlined workflow, enhancing overall productivity and team cohesion.

Mail-in-a-Box allows you to establish your very own mail service provider with just a few straightforward steps, similar to creating a personalized version of Gmail that you have complete control over. Essentially, it transforms a new cloud computer into a fully functional mail server, and you don’t need to possess advanced technical skills to get it up and running. Each Mail-in-a-Box setup comes equipped with webmail access and an IMAP/SMTP server, making it compatible with both mobile devices and desktop email applications. Additionally, it offers synchronization for contacts and calendars, ensuring that all your information stays up to date across devices. Moreover, the system includes essential mail features such as spam protection through filtering and greylisting, customizable mail filter rules, automatic configuration for email clients, and scheduled backups to services like Amazon S3. Another advantage is its automatic DNS configuration, which simplifies the process when you allow it to function as your nameserver, enabling it to establish crucial DNS records that enhance mail deliverability and security, including SPF, DKIM, DMARC, and MTA-STS. Furthermore, when DNSSEC is activated along with DANE TLSA, it significantly elevates the level of security for your email communications.

WinGate Proxy Server serves as an efficient and versatile HTTP Proxy server, SOCKS server, and integrated Internet gateway, tailored to address the access control, security, and communication requirements of modern enterprises. With a diverse array of features, it offers flexible licensing options that can adapt to the budgets of different users, whether for a large corporation, a small business, or a residential network. This server enables the sharing of various types of Internet connections, permitting numerous users to browse the web, access email, and utilize other online applications as if they were directly online. Regardless of whether the connection is through a standard dial-up modem or a high-speed fiber line, WinGate Proxy Server enhances the overall usage of that connection. Furthermore, it is compatible with multiple Internet protocols, facilitating the functionality of applications including web browsers, messaging tools, FTP, and SSL. Overall, WinGate Proxy Server is an invaluable tool for any organization looking to streamline its internet access and improve security measures.

Mail from external sources is collected by Mercury and deposited into the designated mailbox of the recipient, enabling the user to retrieve it whenever they wish. When local users wish to send messages to the outside, these messages are forwarded to Mercury, which manages the delivery process, alleviating the workload on the user's device and permitting them to focus on other tasks. With a dialup connection, only the mail server needs to have access to that link, meaning individual workstations do not require their own modems or Internet connections. This setup allows the mail server to continue managing email even if the client workstations are powered down, thereby supporting functionalities that require constant service availability, such as automatic replies and auto-forwarding. As a result, users enjoy a seamless experience without the need for constant vigilance over their email communications.

We offer a digitally sovereign solution that enables you to manage your emails and calendars effectively, organize tasks, and maintain communication with team members through video conferences. Kopano Groupware serves as a robust email and calendaring platform, functioning similarly to Microsoft Outlook and Exchange. It supports installations for over 100,000 users, making it scalable for various organizational needs. This email and calendar server delivers essential communication and organizational information to users across all their devices while fostering collaboration among teams. Additionally, users can collaboratively edit documents within shared public folders or share content directly from their personal inboxes, enhancing teamwork and productivity.

SmarterMail is the ideal Microsoft Exchange alternative. First, it's the only business email server on the market that offers native support for the protocols that power Exchange: MAPI, EWS, and EAS. It does this without the need for any additional software or plug-ins for Microsoft Outlook or other clients -- desktop and mobile! Best of all, it offers all of the features of Exchange, but at a FRACTION of the cost. In addition, features like audio and video group chat, and Online Meetings for team meetings and group collaboration are included at no extra charge. It's designed to provide the functionality businesses need, without sacrificing secure, reliable access to business, and personal, communication.

Exim serves as a mail transfer agent (MTA) for Unix-like operating systems. Initially developed by Philip Hazel in 1995 for the University of Cambridge Computing Service's email systems, Exim is released under the GPL, allowing users to freely download, utilize, and modify it. While it shares some similarities with Smail 3, Exim has evolved to offer greater user-friendliness and flexibility. Both Exim and Smail 3 operate on the Sendmail design model, where a single main binary manages all MTA functionalities. Although this monolithic architecture is sometimes viewed as less secure and slower, Exim boasts a superior security record compared to Sendmail and matches the performance of Qmail and Postfix, particularly in advanced functions like queue management, address routing, and testing. Notably, Exim lacks a built-in Graphical User Interface (GUI) for configuration, although some Linux distributions may provide one, enhancing its accessibility for users who prefer a visual approach. As a result, Exim remains a versatile choice for those looking to manage email systems effectively.

The optimal approach to constructing your mail server using open source software is to utilize platforms such as CentOS Stream, Rocky, Alma, Debian, Ubuntu, FreeBSD, and OpenBSD. By employing iRedMail, you can set up a FREE, OPEN SOURCE, and COMPLETELY FUNCTIONAL mail server in just a few minutes. We have taken care of the complexities by assembling all necessary open source components and implementing best practices, allowing our product to handle all essential tasks on your behalf. In addition, we provide professional support to assist you should you encounter any issues. You maintain complete ownership of your personal data stored on your hard drive, giving you the ability to control email security and review transaction logs. No external organization has access to the content of your communications. All components integrated into iRedMail are based on open source software, ensuring you receive bug fixes and updates from reputable Linux/BSD vendors. With iRedMail, you are not only building a mail server but also gaining peace of mind knowing that your email system is secure and private. In this way, iRedMail stands out as the definitive solution for those looking to establish a mail server using open source software.

Take back your autonomy and safeguard your personal information by setting up your own email server, a process that can be completed in under 10 minutes! With Modoboa, you can establish your email server at no cost in less than 10 minutes. When it comes to establishing a mailbox, you typically have a few choices: - Rely on services provided by internet and infrastructure companies (like Orange, Vodafone, OVH, or Gandi), which often require a monthly or annual fee, but they come with limitations on customization, configuration options, and the number of domains and mailboxes you can use. - Opt for free email services (such as Gmail, Live, or Yahoo), which come with restrictions and often exploit your data for commercial gain. - Set up your own email server, although this usually demands a significant level of technical expertise for proper installation and configuration. Modoboa presents a viable alternative to these three options. It liberates you from the constraints of traditional email providers, allowing anyone to create a secure email server independently. Best of all, this entire process takes less than 10 minutes and is completely free of charge. Embrace the freedom of managing your own email with ease!

The system analyzes all web traffic and can block specific websites through both HTTP and HTTPS using the Squid proxy. It is integrated with ClamAV antivirus and employs site blacklists for enhanced security. The setup features a multi-domain web server powered by a ready LAMP stack, allowing for the hosting of multiple domain names on a single server. Built on NextCloud, it offers universal access to your files via the web, personal computers, or mobile devices, ensuring you can access your information from anywhere. Additionally, it provides a private alternative to Slack through the Mattermost platform, which facilitates secure collaboration among teams. The modern web interface, built on Cockpit, streamlines common administrative tasks and boasts a quick and straightforward installation process. This infrastructure is based on CentOS/RHEL, a widely used server distribution known for its routine security updates and exceptional stability, making it a reliable choice for various applications. With this setup, users can benefit from both functional versatility and robust security measures.

Our comprehensive Unified Communications technology is anchored by the CommuniGate Pro platform. This system facilitates extensive Unified Communications through open APIs that allow seamless integration with various business applications. With the ability to scale to hundreds of millions of accounts, CommuniGate Pro is perfectly suited for large-scale alert systems, multimodal communications in web applications, or highly secure network architectures. Importantly, achieving such scale does not compromise efficiency or reliability; the platform is exceptionally agile and capable of supporting resilient applications in military and embedded environments. Furthermore, CommuniGate Pro has received approval for use by governmental agencies in both Europe and the USA. Its reputation for outstanding stability—boasting impressive uptimes akin to VMS—has made it a trusted choice among military, transportation, and research institutions. Additionally, the platform enables banks to efficiently manage email services for millions of clients while ensuring compliance with regulatory standards. The server's signaling capabilities can also be effectively implemented within a hybrid system, enhancing its versatility even further. This makes CommuniGate Pro a top-tier solution for organizations looking to optimize their communications infrastructure.

mailbox offers a secure digital workplace designed to meet the highest standards of data protection and compliance. Developed and operated in Germany, the mailbox Suite combines email, calendar, contacts, office tools, video meetings, and cloud storage in one simple, intuitive environment. As a European provider, mailbox rejects tracking and data monetisation. We prioritise transparency and user control, giving businesses, institutions, and individuals full digital sovereignty – without compromising productivity. mailbox is part of the Heinlein Group, an expert in secure and open communication for more than 30 years.

qmail serves as a robust, secure, and efficient message transfer agent that prioritizes simplicity. Its emphasis on security is not merely an aspiration but a fundamental necessity, given the critical nature of mail delivery for users, which must remain uninterrupted and entirely secure. With a philosophy that ensures a message, once accepted, is never lost, qmail adopts a straight-paper-path approach to guarantee reliability. Additionally, it offers optional support for maildir, a highly reliable mailbox format that prevents corruption during system crashes—unlike traditional mbox files and mh folders. This feature allows users to read their emails safely over NFS, with the added advantage that multiple NFS clients can deliver emails concurrently. Notably, qmail's design is considerably more compact than other Internet MTAs, which often rely on separate mechanisms for forwarding, aliasing, and mailing lists; instead, qmail streamlines this with a singular forwarding system that empowers users to manage their own mailing lists efficiently. Ultimately, qmail stands out not just for its performance but also for its innovative approach to email management.

Horde stands out as the most adaptable groupware solution available, making it an ideal foundation for developing your business productivity applications. It boasts compatibility with a wider array of backends—including all major SQL, LDAP, IMAP, Sieve, SMTP, and caching platforms—than any other open-source groupware option currently on the market. As a result, you can seamlessly integrate your existing user base without requiring them to remember additional passwords. The extensive feature set of Horde is on par with the most prominent enterprise email systems, offering remarkable capabilities that hold up against competitors in our core applications, such as mail, calendar, and address book, as well as excelling in secondary applications like time tracking, wikis, and ticketing systems. Furthermore, this versatility ensures that users can tailor their experience to meet their unique needs, enhancing overall productivity and satisfaction.

James represents the Java Apache Mail Enterprise Server, featuring a modular structure that utilizes a comprehensive collection of contemporary and effective components. This architecture ultimately delivers fully-functional, stable, secure, and extendable mail servers that operate on the Java Virtual Machine (JVM). You can craft a tailored email management solution by selecting the necessary components, thanks to the Inversion of Control mail platform it offers. Additionally, you can enhance your email processing capabilities by customizing filtering and routing rules through the James Mailet Container. The Apache James project integrates various libraries that constitute James, ensuring that the services are readily available for download from Apache mirrors, making it easier for users to implement their email solutions. As a result, this flexibility allows for significant customization to meet diverse communication needs.

Halon MTA makes your company more competitive by delivering important emails promptly and implementing features quickly. You will also reduce your development and maintenance costs by up to half. The Halon MTA allows for flexible email operations and security. It allows large-scale organizations to offer competitive features through rapid implementation. Halon MTA consolidates email infrastructure, reducing complexity and risk. It makes email infrastructure easy to manage, scalable, and rich in functionality. Poor customer experience due to slow and expensive implementation of new standards and email features. Halon improves email service competitiveness through rapid implementation and reliable deployment. Halon's holistic approach reduces system complexity, in contrast to traditional layers of email infrastructure.

KingSMTP (formerly known as Kingmailer, founded in 2017) is a simple and fully featured mail server / SMTP service for use by anyone, not just developers. Start sending, receiving or routing your emails with a few clicks.

hMailServer is a complimentary and open-source email server designed for the Microsoft Windows platform. It is utilized globally by various entities, including internet service providers, businesses, governmental organizations, educational institutions, and individual users with a passion for technology. The server accommodates standard email protocols such as IMAP, SMTP, and POP3, making it compatible with numerous existing webmail systems. Additionally, it features a customizable score-based spam protection system and can be integrated with virus scanners to ensure that all incoming and outgoing emails are thoroughly checked for threats. This versatility makes hMailServer a popular choice for those seeking a reliable email solution.

If you're considering handling a cloud migration on your own, we strongly suggest consulting with our migration specialists before proceeding, as their expertise can ensure a smooth transition. With our technical knowledge at your disposal, we can transform your cloud migration into a seamless experience. The cloud revolutionizes our work processes and simplifies tasks, aligning perfectly with our motto of “Simplifying Technology.” We offer cloud hosting solutions designed to enhance your everyday operations. Currently, we proudly serve over 8,000 satisfied clients, have completed more than 35 million server deployments, and maintain an impressive uptime of 99.995%. Our flagship product, MailXaminer, stands out in the Digital Forensics field, offering various viewers that assist investigation officers in accessing and analyzing email messages comprehensively. We also collaborate with several forensic agencies, providing them with a range of solutions to effectively assess evidence using the right tools. Recent updates to our software have introduced a host of new features along with enhanced security measures, demonstrating our commitment to continuous improvement. As we move forward, we remain dedicated to empowering our clients with reliable technology that meets their evolving needs.

Mailcow: Dockerized is a self-hosted email and groupware solution built on Docker technology. It incorporates a variety of established and reliable components that work together to create a hassle-free email server experience. Each application is encapsulated within its own container, all linked through a bridged network for seamless interaction and functionality. This modular approach enhances the scalability and maintainability of the server setup.

WinDeveloper Message Recall is compatible with Exchange versions 2007 and 2010, while earlier versions are not supported. Additionally, it works with Windows Small Business Server packages that include these Exchange versions. This software is designed as a 64-bit application and is compatible with all x64 Windows Server platforms, which include Windows 2003, Windows 2008, and Windows 2008 R2. For organizations operating MS Exchange 2007/2010 on a single server, the installation of WinDeveloper Message Recall can be done directly on the Exchange server itself. The software enhances functionality by introducing several essential features that are not available by default. Notably, it allows for a reliable email recalling process, ensuring that users can efficiently retract an email if they quickly realize a mistake, without the recipients ever being aware of the retraction. This capability holds true regardless of whether the email was sent to local or international recipients, making it a valuable tool in professional communication. In summary, WinDeveloper Message Recall significantly improves email management, providing peace of mind to users in their correspondence.

MailSite Fusion serves as a comprehensive email, calendar, and contact server for Windows, offering seamless over-the-air synchronization with various smartphones, full native Outlook integration, an advanced AJAX web client, and a server for sharing calendars and contacts, which can also sync and publish to multiple other clients. For three consecutive years, it has consistently ranked among the top three mail server products according to the readers of Windows IT Pro Magazine. Given the essential nature of email services to your organization, it is crucial to choose a reliable product from a company that has demonstrated expertise in communication software. So, what makes this mail server stand out? Rockliffe has dedicated itself to the development and enhancement of email server and security solutions for businesses and service providers since 1995, addressing your concerns with a sense of urgency. Engineered from the ground up to prioritize speed, stability, and security, MailSite Fusion is equipped to fulfill your most pressing needs and expectations effectively. Moreover, its robust features ensure that you can manage your communications seamlessly while maintaining a high level of security.

Haraka is capable of managing thousands of simultaneous connections and can process an impressive volume of messages each second. Both Haraka and its plugins are developed using asynchronous JavaScript, resulting in exceptional speed and performance. With robust spam protection mechanisms available through its plugins, Haraka serves effectively as a filtering MTA. Additionally, it functions well as a Mail Submission Agent (MSA) on port 587 when utilizing authentication and DKIM signing plugins. Unlike traditional mail servers such as Exchange or Postfix, Haraka is not designed to act as a mail storage solution, Local Delivery Agent (LDA), or an IMAP server like Dovecot or Courier. Instead, it is typically combined with these systems for enhanced functionality. The built-in outbound mail delivery engine of Haraka is scalable, ensuring efficient processing of messages marked for relaying through authentication plugins, which are automatically queued for delivery. Furthermore, Haraka's plugin framework allows for easy extensions, making it a complementary option for traditional MTAs that may lack adequate filtering capabilities, thus enhancing the overall email handling process. This modular approach provides flexibility, enabling users to tailor their email solutions according to specific needs.

Dovecot Pro stands out as a comprehensive email solution that offers exceptional scalability, impressive performance, optimal hardware usage, and superior support for major telecommunications companies, internet service providers, and hosting services globally. Holding a dominant 76% share of the email backend market, Dovecot Pro is trusted by its customers for reliable performance and minimal downtime. Its efficient management of hardware resources, alongside innovative monitoring tools for statistics and administration, effectively lowers ownership costs while saving both time and maintenance expenses. Additionally, Dovecot Pro has the capacity to expand both vertically and horizontally, accommodating hundreds of servers, millions of users, and multiple physical locations. The architecture is stateless and native, allowing for maximum adaptability, as every significant component can be independently deployed on dedicated nodes. Moreover, Dovecot Pro excels in providing top-notch support for all essential email standards, ensuring seamless Mail Delivery Agent capability through LMTP and Sieve, while also facilitating mail retrieval for various clients via IMAP and POP3 protocols. This robust infrastructure underlines its commitment to meeting the diverse needs of its client base.

The relay restrictions have been entirely reimagined to feature a more user-friendly interface that allows for enhanced control over relay security measures. Additionally, EIMS introduces its own Domain Name Resolver (DNR), designed to address issues present in the Open Transport DNR and to improve performance compared to the OS X DNR, although it currently lacks support for non-recursive DNS configurations. Furthermore, a new SMTP Submit port has been added, operating on TCP port 587 by default, mirroring the functionality of the standard SMTP port; this is particularly beneficial for clients whose ISPs restrict access to port 25. An option to set a maximum number of recipients per message has been incorporated, and the previously mandatory Expand SMTP Addresses feature can now be disabled, a change from EIMS versions 3.1 and earlier where it was always enabled. In addition, the SMTP server on both ports 25 and 587 is now equipped to log Telnet connections and recognize activities resembling port scans, enhancing security monitoring capabilities. Overall, these updates aim to provide users with greater flexibility and security when managing their email services.

Dovecot stands out as a remarkable option for installations of any size, whether small or large. Notably, it ranks among the top IMAP servers, offering robust performance while seamlessly supporting both mbox and Maildir formats. Its mailboxes come with transparent indexing that enhances speed and retains full compatibility with traditional mailbox management tools. Adhering to industry standards, Dovecot successfully passes all compliance tests for IMAP servers, unlike many of its competitors that often fall short. One of its impressive features is the self-optimizing indexes, which provide just the necessary information that users typically require without excess. Additionally, Dovecot incorporates self-healing capabilities, autonomously addressing many issues it detects, such as corrupted index files, while ensuring that any problems encountered are logged for further investigation by administrators. Furthermore, Dovecot is designed with user-friendliness in mind, as it aims to present common error messages in a straightforward and comprehensible manner, making it easier for administrators to resolve issues. Overall, Dovecot's combination of performance, compliance, and user-centric features makes it a top-tier choice for email server solutions.

Mailu is a versatile and straightforward mail server offered through a collection of Docker images, designed as free and open-source software that encourages user feedback and contributions. The objective of this project is to deliver an easy-to-install and maintain mail server that is comprehensive and avoids the inclusion of proprietary tools or unrelated features that are frequently part of mainstream groupware solutions. Key functionalities of Mailu encompass: A standard email server setup supporting IMAP and IMAP+, SMTP, and Submission with automated configuration profiles for various email clients. Sophisticated email capabilities, including aliases, domain aliases, and custom routing options. Web-based access featuring multiple webmail interfaces alongside an administrative dashboard. User-centric functionalities such as aliases, auto-reply, auto-forward, and the ability to fetch accounts from other servers. Administrative features that cater to global management, making announcements, domain-specific delegation, and setting quotas. Robust security measures that enforce TLS protocols, integrate DANE and MTA-STS, utilize Let's Encrypt for certificates, provide outgoing DKIM signatures, and incorporate an anti-virus scanner alongside Snuffleupagus for enhanced protection against malware and harmful attachments. Effective anti-spam tools that include auto-learning algorithms, greylisting techniques, DMARC and SPF support, and measures to prevent email spoofing. Overall, Mailu stands out as a comprehensive solution for users seeking a reliable and secure mail server environment.

Setting up a fully operational mail server can be achieved in just a few minutes, primarily spent waiting for the necessary scripts to execute. The entire system is engineered with sensible defaults, allowing you to get started swiftly without needing in-depth knowledge of the internal workings or risking system integrity with potentially harmful choices. User information and configurations are meticulously separated from the executable files, with the user database maintained in an SQLite format, which is file-based. This structure ensures that Poste.io seamlessly integrates with external storage options, making tasks like migration, backups, and updates straightforward and predominantly involving file handling. Designed with a focus on security from its inception, Poste.io addresses the serious security challenges that have historically plagued the internet. Rather than compromising on compatibility with outdated email clients and vulnerable authentication processes, it prioritizes features that align with contemporary security standards, ensuring users can trust their communications. Additionally, this commitment to security reflects an awareness of the evolving landscape of cyber threats, making Poste.io a robust choice for reliable email management.

Cyrus IMAP serves as a server for emails, contacts, and calendars, and is available as free and open-source software. Among its many features are high-speed performance, strong security measures, and efficient resource management. Additionally, it includes powerful search capabilities and supports both CardDAV and CalDAV protocols. The platform ensures robust data storage and offers replication features, making it suitable for large-scale installations. Flexible filtering through Sieve allows for customizable email handling, while integration with antivirus and antispam toolkits enhances its security. Moreover, Cyrus IMAP effectively manages deliverability standards such as SPF, DKIM, and DMARC. It provides extensive authentication possibilities through Cyrus SASL and includes support for JMAP, alongside a comprehensive array of supported standards that enhance its versatility. Overall, Cyrus IMAP is an ideal solution for organizations seeking a reliable and feature-rich email server.

An efficient way to oversee multiple email accounts seamlessly is essential. If your email provider lacks push notifications, myMail has you covered. Tired of being disturbed by late-night emails or having your barbecue interrupted? You can choose when to receive those notifications, putting you in control. myMail enhances your inbox with profile pictures of your contacts, allowing you to instantly recognize who is reaching out. Additionally, it features icons from popular platforms for quick sender identification. For friends without avatars, no worries—myMail simply displays the initial of their name. Ultimately, myMail excels at what it’s designed to do: streamline your email management effectively, ensuring you never miss an important message. With traffic compression technology, your emails arrive in your inbox rapidly, allowing you to save your data for other activities, such as enjoying that entertaining video. This app maintains impressive speed even as your collection of messages and contacts expands significantly. Plus, myMail's user-friendly interface makes navigating your email a breeze, enhancing your overall experience.

OpenSMTPD serves as a free implementation of the SMTP protocol for server-side email communication, as laid out in RFC 5321, and incorporates several additional standard extensions. This software enables standard machines to facilitate email exchanges with other systems that also utilize the SMTP protocol. Born from a desire for a more satisfactory alternative to existing solutions, OpenSMTPD offers a comprehensive SMTP implementation. The project is mainly driven by developers Gilles Chehade and Eric Faurot, alongside contributions from numerous OpenBSD developers and collaborators from various other communities. Its development reflects a commitment to improving email server functionality and reliability across different platforms.