On 07/20/2015 01:08 PM, Benjamin Hackl wrote:
> ... might be just here at AAU. I found my notifications in the spam folder.


The new host is missing reverse DNS.

  Jul 20 14:07:35 mx1 postfix/smtpd[23912]: NOQUEUE: reject: RCPT from
  unknown[128.208.160.253]: 550 5.7.1 Client host rejected: cannot find
  your reverse hostname, [128.208.160.253]; from=<t...@sagemath.org>
  to=<mich...@orlitzky.com> proto=ESMTP helo=<trac.sagemath.org>

This is a common "safe" restriction. The fix is easy -- add a PTR record
for 128.208.160.253 pointing to trac.sagemath.org.

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