I already tried to connect with an certificate that has not expired same problem, but I resolved this issue using this hint:
https://launchpad.net/distros/ubuntu/+source/evolution/+bug/59632 Regards, Marcel Juhnke -- Cannot connect to IMAP-Server with expired SSL-Certificate https://launchpad.net/bugs/58714 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs