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

Standalone / Contained Environment?
This means that you can not send to or receive from a service on the public internet. Mail can only be delivered within this contained environment we have set up.

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. No need to ask if and when it is done or available.