I've set up two domains on my server A.eu and B.com.
Both were working but after a day of use, the B domain stopped receivining mail.
Here's the message gmail returns when trying to send the mail:
I only have dnmasq set up for the A.eu domain.Code:Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <firstname.lastname@example.org>: Sender address rejected: Access denied (state 14).