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[OCLUG-Tech] Postifx/SMTP problem - Sender address rejected

  • Subject: [OCLUG-Tech] Postifx/SMTP problem - Sender address rejected
  • From: Michael Walma <michael [ at ] walma [ dot ] org>
  • Date: Fri, 3 Feb 2006 21:32:33 -0500
Hello All:

I have an odd problem where some sites are refusing to accept mail from me.  
99% of sites will accept mail from me, a but a few reject mail with the 
following response:

Feb  3 20:33:04 ringo postfix/smtp[7229]: B83C519B01: 
to=<person [ at ] destination [ dot ] COM>, relay=smtp.destination.COM[], 
delay=7507, status=deferred (host smtp.destination.COM[] said: 
450 <person [ at ] walma [ dot ] org>: Sender address rejected: Domain not found (in reply 
to RCPT TO command))

(I've changed email and IP addresses to protect the innocent.)

I assumed that the problem was DNS, but I've verified that my DNS is RFC 
compliant (or so www.dnsreport.com says it is), and besides, the sites to 
which I cannot send generally (with one exception) have no problem sending 
mail to me.  I have a fixed IP, I don't appear to be on any blacklists and my 
IP is properly delegated to me, that is, reverse DNS works.

The problem sites tend to be large ones, government departments and a large 
corporation.  They tend not to be too quick to respond to my requests for 
helping in debugging my problem.

I am running Postfix 2.1.5-r1 and BIND 9.2.5.

Any thoughts on what I should look at?

Thanks in advance for any help.