For a beginner, can anyone recommend a good method of setting up a encrypted IMAP server (on port 993) or at least TLS POP3 email ? There are plenty of examples of opportunistic client side email encryption with PGP or FireGPG or Enigmail, but that is not the answer I am looking for because swapping keys is complicated for some users (and it needs to be useable by everyone, not just some)
I would basically like to know how to setup a company of 50 people with encrypted email , using a self-signed company cert, so that they can connect with Thunderbird without any additional configuration necessary.
Or, something a little like the experience you get when connecting to Gmail TLS email using Thunderbird.
A simple pointing in the right direction may get rewarded as an answer.