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invalid/host-not-in-DNS return address not allowed

Posted on 2003-10-29
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Last Modified: 2007-12-19
I was able to send mails using the unix systems those have internal ip 10.10.10.x to one of our public mail servers. Suddenly the messages started bouncing back since 10 days and showing up the error message as:

Diagnostic-Code: SMTP; 550 5.1.8 invalid/host-not-in-DNS return address not allo
wed

I am just using simple sendmail client and the sendmail daemon is not running on them.
I am able to send mails from the same systems to yahoo mail and hotmail without any problem.

Thanks in advance.

Prasad

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Question by:prasadklk
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by:Gns
ID: 9644664
Well, is the "troublesome" MTA able to resolve the return address name then? Seems likely that something changed there, souldn't you say.

-- Glenn
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prasadklk earned 0 total points
ID: 9645308
I have resolved the problem myself.
by adding an entry to sendmail.cf as Dj<smtpmailserver.domain.com>.
Thanks,
Prasad
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by:Gns
ID: 9649362
Fine by me.

-- Glenn
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