On 05.05.2017 at 14:48h Georg Sotsas wrote:

The mails sent to xxxx.x...@guilford.com <mailto:xxxx.x...@guilford.com>
remain in the queue with this error:
Host or domain name not found. Name service error for name=guilford.com
<http://guilford.com> type=MX: Host not found, try again

Just working here:

user@host:~$ postconf mail_version
mail_version = 2.11.0

May 5 22:33:14 mx0.backschues.net postfix/smtp[3794]: 3wKNrR6HSqz3Q: to=<just4test...@guilford.com>, relay=smtp.notes.na.collabserv.com[158.85.210.111]:25, delay=2.6, delays=0.02/0.01/2/0.59, dsn=2.0.0, status=sent (250 OK <17050520-8244-0000-0000-0000DBF7FB26>)

--
Regards Jörg

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