"I'm currently trying Postbox 3.x, together with SpamSieve, and I think it's the best compromise for me yet, though it's a big change in working style from Eudora, though closer to Thunderbird (whose code it's based on) or even Apple Mail. The most Eudora-like program out there now, though is GyazMail. I doesn't handle HTML as elegantly as Postbox (which is essentially based on Mozilla/Firefox/Thunderbird) or Apple Mail (based on Webkit/Safari), but it's a lot better than Eudora, and it's got the separate window interface like classic Eudora.
To get into Postbox, you need to export to Mail first, though, as it doesn't (any longer) support Eudora import."
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