Update: Domain Monster: Email server issues (again)

Seems the problem is actually worse than I thought. I was aware of the issue with connecting to the incoming mail server, but found out a few hours ago from an ex, that there's also an issue with people sending me e-mail.

Still no idea what the problem actually is (spoke to Domain Monster again a few moments ago, and they're still working on it, MX and A records are absolutely fine), but if