Detecting server, rejecting login credentials [CLOSED]

Today at 15:00 emails stopped working with my system.

I can still login via a mail browser.

Attempting to diangose/fix gives the error that the login detail credentials are wrong. I’ve tried this multiple times now but still can’t fix including a reboot.




Please note, the host and account name aren’t actually Sinfo - this is just from taking the print screen shortcut. It is written [email protected] for both

This thread is now closed, there was some issues in the DNS records.