Mail received by server not being forwarded

For the last few months, mails sent to my server ( has not been forwarded to designated addresses.

Here is a more detailed description of the problem.

In the Virtualmin control panel, if you click ‘Edit users’ by the left, you will see a list of users.

One of the users I have created is called

If you click that user, then go to the ‘Mail forwarding section’, you can specify users that you want mail to be forwarded to, when someone sends email to

It used to be the case that when someone would send an email to, it would be forwarded to those specified addresses, but this is no longer the case.

Is there a place in Virtualmin that I can look to see what might be happening to mails that are being sent, what might be happening to them, and what I can do to resolve this?

Please let me know if there is any additional information I need to provide.

me too, used to work, was tested when the user mail was set up and worked then but not now. Ordinary forum mail arrives ok and no other client mail issues.