Preface
The E-Mail service we offer is standalone / a contained environment.

To make this work the way we want it to, we've had to develop the software ourselves, and what it offers today feels fairly stable and feature-complete for all intents and purposes.

POP3
Does currently not support APOP, CRAM-MD5 or SSL/TLS.

SMTP
Does currently not support CRAM-MD5, SSL/TLS.

IMAP
While we are working on writing an IMAP server, this has been marked as unsupported/unavailable for the time being.

This is a bit unfortunate, but it is what it is. We've hit a few roadblocks but will occasionally work on this.