Hello, we are encountering a very strange problem on our Postfix (2.11.0-1ubuntu1) Mail Relay.
The mails sent to xxxx.x...@guilford.com remain in the queue with this error: Host or domain name not found. Name service error for name=guilford.com type=MX: Host not found, try again The DNS resolution is working fine (and all the other Emails leave the mail relay without any problems): https://gist.github.com/anonymous/a282b54e74c3cbbbe31c2b0391fc0c97 I've tried to run postfix (smtp/submission) with and without chroot. But finally I have no clue on what is going wrong with this domain. Some help is very welcome- Thanks in advance
