I'm still using Eudora because I can't bear to part with it! Yes, its poor HTML renderer and lack of UTF-8 support, amongst other things, have no place in 2023, but other modern mail clients still seem to fall short on the features Eudora just gets right.

There's hope that the HERMES Mail project, which was formed after the Eudora source code was release, will one day be a viable replacement:

https://sourceforge.net/projects/hermesmail/