Non-craptactular IMAP support. Eudora is a consistent PITA if you're in an IMAP environment with it refusing to do SSL some times, garbling it's index files you can't see any of your messages, or my personal favorite, scrambling it's indexes so the from/subject lines in the message list don't match the messages it brings up.
If you're just using insecure POP Eudora is probably still great, but around my office Eudora causes more support calls than even the flaky Lotus Notes servers.

how to get this slackware 9 raid smp to work on my MAndrake?

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