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I noticed many logs about rejecting emails from atlassian. Here a snipplet from my server-log:
May 30 09:37:34 mail postfix/postscreen: CONNECT from [184.108.40.206]:47641 to [10.10.10.3]:25
May 30 09:37:34 mail postfix/postscreen: PASS OLD [220.127.116.11]:47641
May 30 09:37:34 mail postfix/smtpd: warning: hostname mta2.e.atlassian.com does not resolve to address 18.104.22.168
May 30 09:37:34 mail postfix/smtpd: connect from unknown[22.214.171.124]
May 30 09:37:35 mail postfix/smtpd: NOQUEUE: reject: RCPT from unknown[126.96.36.199]: 450 4.7.25 Client host rejected: cannot find your hostname, [188.8.131.52]; from=<bounce-1441644_HTMLfirstname.lastname@example.org> to=<*********> proto=ESMTP helo=<mta.e.atlassian.com>
May 30 09:37:35 mail postfix/smtpd: disconnect from unknown[184.108.40.206] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6
So there is some problem with resolving hostname for mta2.e.atlassian.com. Whats wrong?
Your computer is unable to find that address. I'd sugest that there is something wrong with your DNS setup somewhere (possibly a cache needs flushing somewhere?)