Plesk v12.5.30_build1205150826.19 os_CentOS 7
This morning, one client suddenly began having his email rejected. His is apparently the only one this happens to. He's not blacklisted either on my server or on any block list that I can find.
The rejection/failure he receives looks like this:
Delivery has failed to these recipients or groups:
me@mydomain.com (or any other address on the server)
A problem occurred during the delivery of this...
Mail from one server being rejected
This morning, one client suddenly began having his email rejected. His is apparently the only one this happens to. He's not blacklisted either on my server or on any block list that I can find.
The rejection/failure he receives looks like this:
Delivery has failed to these recipients or groups:
me@mydomain.com (or any other address on the server)
A problem occurred during the delivery of this...
Mail from one server being rejected