Qualcomm's Eudora Place
Mutt - Ankaŭ Esperantlingva!
Forté Home Page : Agent
Eudora was my favorite *standalone* email proggie, and with Eudora Lite (freeware) you'll probably get everything you need. But Agent does email in addition to newsreading, and since I finally got around to purchasing it and since it does email very well, that's what I'm using now. (Well, actually, not anymore. Though I generally prefer the functionality of local email clients, I've found the convenience of Web-based email to far outweigh those advantages! I can access it from anywhere. Maybe it's time to investigate IMAP.)
Hmm, interesting... The Eudora homepage says "The Paid mode commercial versions of Eudora are no longer available. The Sponsored mode versions of Eudora continue to be available for download. An open source version of Eudora is being developed by Mozilla and will be free of charge."
Agent: Agent is my newsreader of choice. It also does email with filtering and spellchecking and multilanguage support, and has lots of other useful features. And you've got to see that toolbar configuration; it is slick! Free Agent is the freeware version, without email and spellchecking, for newsreading only. I'd used it for several years since I didn't need the Agent enhancements. (For the most part I stopped reading the news when my ISP dropped its feed a few years ago. So I haven't used Agent in a while. And I'll snip the tips that used to be here, because they're probably way out of date.)
Agent and alternate character sets: I commented this section because it was way out-of-date and I hadn't verified it for newer versions of Agent on newer versions of Windows. I found that in email and news most people use one of the plain ASCII alternatives for Esperanto text, iksismo or hoismo ktp, so I stopped worrying about proper display of the occasional Latin 3 text. In fact, I got pretty good at reading the raw Latin 3 and Unicode "garbage" characters too! (You can View the Page Source if you really want to read it!)