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Re: problem with postfix rejecting email

> On Dec 4, 2007, at 8:00 AM, Bill Tangren wrote:
>> I'm having a problem with postfix, version 2.2.10-1.1.el4. Because
>> of the screwy firewall configuration here, some lcoal email comes
>> in to my email server with no reverse DNS entry. I had been
>> rejecting those, but now that some of our own email is coming in
>> that way, I need to turn it off. I thought I had been using
>> reject_unknown_sender_domain to reject such email, but when I
>> comment it out, I'm still rejecting email with no reverse DNS entry.
> reject_unknown_sender_domain rejects messages when the domain part of
> the SMTP sender address cannot be found in DNS.
>> My question: How do I turn this feature off?
>> This is an example of a rejection in the log:
>> Dec  4 10:49:47 aa postfix/smtpd[19280]: NOQUEUE: reject: RCPT from
>> unknown[x.x.x.x]: 450 Client host rejected: cannot find your
>> hostname, [x.x.x.x]; from=<emailaddy> to=<localuser> proto=ESMTP
>> helo=<sender>
> Look for a reject_unknown_client directive in one of the
> smtpd_mumble_restrictions in your main.cf -- then remove it.

That did it! I have email poring in now.

Now if I can just get the firewall guy to fix the DNS problem so I can put
these restrictions back...


> --
> Ian Ward Comfort <icomfort rescomp stanford edu>
> System Administrator, Student Computing, Stanford University
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Bill Tangren
U.S. Naval Observatory

Ad eundum quo nemo ante iit

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