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Description

Coldletter is an email design and automation layer that helps teams create, manage, and send product emails without replacing their existing email provider. It connects with delivery services such as SendGrid, Postmark, Amazon SES, Mailgun, Resend, and SparkPost, giving companies flexibility while keeping sending infrastructure intact. The platform includes a visual editor where teams can build templates, add variables, reuse blocks, and preview emails across clients such as Gmail, Outlook, and Apple Mail. Every template is designed to be responsive, accessible, and safe for dark mode by default. Developers can trigger templates through a single API request while Coldletter handles rendering, data merging, routing, retries, suppression, and idempotency. Marketing, lifecycle, design, and product teams can use the platform to manage email content without constantly relying on engineering for every change. Journey automation tools allow users to create workflows based on events, schedules, engagement, attributes, or A/B testing paths. Version control, template diffs, rollbacks, localization, test sends, roles, approvals, and analytics help teams manage production emails with more confidence. Coldletter gives organizations a structured way to build polished product emails while improving collaboration between technical and non-technical teams.

Description

Mailgun offers a robust email automation platform tailored for developers. By utilizing Mailgun, users can leverage a comprehensive cloud-based email service designed for sending, receiving, and monitoring emails generated through their applications and websites. The platform is compatible with a variety of programming languages such as Python, Ruby, PHP, Java, and C#. Additionally, Mailgun's tracking capability enables users to monitor all outgoing emails effectively, helping to minimize the likelihood of being classified as spam. This functionality not only enhances email deliverability but also provides valuable insights into user engagement.

API Access

Has API No 

API Access

Has API Yes 

Screenshots View All

No images available

Screenshots View All

Integrations

Axis LMS No 
Blueshift No 
ContractorHUB No 
Convert Pro No 
DeBounce No 
DreamFactory No 
E-Warmup No 
Eazy Ride No 
Influx MD No 
LiveDocs No 
Lytics No 
Mailcoach No 
Marina Edge Pro No 
QuickMail No 
Quickwork No 
Respacio No 
Strapi No 
Thryv No 
Wellyx No 
Workers by Delos No 

Integrations

Axis LMS Yes 
Blueshift Yes 
ContractorHUB Yes 
Convert Pro Yes 
DeBounce Yes 
DreamFactory Yes 
E-Warmup Yes 
Eazy Ride Yes 
Influx MD Yes 
LiveDocs Yes 
Lytics Yes 
Mailcoach Yes 
Marina Edge Pro Yes 
QuickMail Yes 
Quickwork Yes 
Respacio Yes 
Strapi Yes 
Thryv Yes 
Wellyx Yes 
Workers by Delos Yes 

Pricing Details

$0
Free Trial No 
Free Version Yes 

Pricing Details

$0.01/month/user
Starting price $79/month/user
Free Trial Yes 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) Yes 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Vendor Details

Company Name

Optosoftware inc.

Founded

2025

Country

Canada

Website

coldletter.com

Vendor Details

Company Name

Sinch

Founded

2008

Country

Sweden

Website

www.mailgun.com

Product Features

Email Marketing

A/B Testing No 
Artificial Intelligence No 
Auto-Responders No 
CAN SPAM Compliance No 
Customer Surveys No 
Drip Campaigns No 
Dynamic Content No 
Event Triggered Email No 
Image Library No 
Landing Pages/Web Forms No 
Mailing List Management No 
Mobile Optimized Emails No 
Reporting/Analytics No 
Subscriber Management No 
Template Management No 
WYSIWYG Email Editor No 

Email Template Design

A/B Testing No 
Code From Scratch No 
Drag & Drop Editing No 
Image Library No 
Import HTML Code No 
Mobile-Friendly / Responsive No 
Potential Issue Identification No 
Premade Templates No 
Proofing No 
Reporting / Analytics No 
Text Editor No 
Theme Editor No 

Product Features

Email Management

Data Recovery Yes 
Email Archiving Yes 
Email Deletion No 
Email Discovery No 
Email Monitoring Yes 
Email Recall No 
Queue Manager Yes 
Response Management No 
Routing Yes 
Shared Inboxes No 
Signature Management No 
Spam Blocker Yes 
Whitelisting / Blacklisting Yes 

Email Marketing

A/B Testing No 
Artificial Intelligence No 
Auto-Responders No 
CAN SPAM Compliance No 
Customer Surveys No 
Drip Campaigns No 
Dynamic Content No 
Event Triggered Email No 
Image Library No 
Landing Pages/Web Forms No 
Mailing List Management No 
Mobile Optimized Emails No 
Reporting/Analytics No 
Subscriber Management No 
Template Management No 
WYSIWYG Email Editor No 

Email Testing

A/B Testing No 
Accessibility Testing No 
DMARC Analytics No 
Deliverability Rates No 
HTML Validation No 
IP Blacklist Checking No 
Improvement Recommendations No 
Pre-Send Email Testing No 
Preview Across Browsers & Devices No 
Reporting / Analytics No 
Sender Reputation Scoring No 
Spam Testing No 

Email Verification

Bulk Email Verification No 
Catch-all Server Detection No 
Disposable Email Detection No 
Domain Check No 
Mail Server Validation No 
Single Email Verification No 
Spam Trap Detection No 
Syntax Check No 

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