Presumably this depends on how you're trying to authenticate. The released smtpmail doesn't have starttls support, for instance.
Why use it on Ubuntu, though? If exim is set up correctly, Emacs' sendmail method (the default) will DTRT. -- smtpmail.elc can't work https://launchpad.net/bugs/50689 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
