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SMTP Problem "cannot find your hostname"


I noticed many logs about rejecting emails from atlassian. Here a snipplet from my server-log:

May 30 09:37:34 mail postfix/postscreen[32640]: CONNECT from []:47641 to []:25
May 30 09:37:34 mail postfix/postscreen[32640]: PASS OLD []:47641
May 30 09:37:34 mail postfix/smtpd[32576]: warning: hostname does not resolve to address
May 30 09:37:34 mail postfix/smtpd[32576]: connect from unknown[]
May 30 09:37:35 mail postfix/smtpd[32576]: NOQUEUE: reject: RCPT from unknown[]: 450 4.7.25 Client host rejected: cannot find your hostname, []; from=<> to=<*********> proto=ESMTP helo=<>
May 30 09:37:35 mail postfix/smtpd[32576]: disconnect from unknown[] ehlo=2 starttls=1 mail=1 rcpt=0/1 quit=1 commands=5/6 


So there is some problem with resolving hostname for Whats wrong?

Best regards

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Nic Brough -Adaptavist-
Community Leader
Community Leader
Community Leaders are connectors, ambassadors, and mentors. On the online community, they serve as thought leaders, product experts, and moderators.
May 30, 2020

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?)

Thank you for your reply.

I found out that DNS-Request was blocked by Firewall because the configuration of firewall was accidentally overwritten. Now it's fixed and it works.

Best regards

AUG Leaders

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