Don't use any version which uses AmiSSL v3 at least, it trashes memory pretty badly (you can expect OWB crashing and other random things to happen if you do use it).

68k version did use the buggy AmiSSL v3 at least earlier.. probably still. And that's why 0.40 MorphOS build uses AmiSSL v1 instead, but unfortunately v1 isn't compatible for example with gmail anymore.

I've been using SimpleMail 1.1 MorphOS (which uses openssl instead of amissl) lately and it's been working quite fine with POP3 and SSL...