Email: How can I enforce secure client connections?
I'm using Exim and Dovecot and DirectAdmin on the server. What I would like to do is force people to use secure e-mail. For Pop3 and and IMAP that's easy, just don't open them on the firewall and they will be forced to use Pop3s, and IMAPS. However, I don't know how to handle SMTP (25) and submission (587). If I block 25, then I would guess that I wouldn't get mail from other mail servers because if they couldn't connect on 25, they wouldn't try 465. So let's say I leave 25 open. Then how do I force e-mail clients to use submission(587) instead? Submission is a problem itself since it uses the same port for both secure and unsecure.
I hope there you will find a solution for your problem.
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