> There is a way to add 'alternate names' Subject Altenative Names. > but I don't think TBird (or most other Clients) will recognize them. The only client I know of NOT suporting subjectAltName is plain old pine.
You may have a try at imaps://imap.math.uni-bonn.de (or at https://www.math.uni-bonn.de in case you want to check HTTPS clients). The certificates are NOT self-signed, but signed with a custom CA cert (to be found at http://www.math.uni-bonn.de/people/support/MathInstUniBonn.pem in case you care).
