Originally Posted by till
Please add localhost.localdomain at the end of the file /etc/postfix/local-host-names on your server and restart postfix. Make also sure that localhost.localdomain points to the IP 127.0.0.1 in your /etc/hosts file.
I just experienced this today on an email server that has ran flawlessly for nearly 2 years. About 4000 bounced emails, and many of those replies being copied to many email boxes on our email server.
Really. Really. Weird.
Added this above fix, and it seemed to have worked. I just have to know. What gave or broke?
Two years of being good. Then... BAM! 4000 emails being bounced. All having the same "firstname.lastname@example.org name service for name localhost.localdomain type=AAAA: Host not found" message.
Was someone in my network being naughty? Do I need to ram their mouse and keyboard up their "you-know-what" for making me research this issue?