From owner-freebsd-questions  Sat Dec 28 18:16:45 2002
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Date: Sat, 28 Dec 2002 18:13:28 -0800
Subject: Re: What are the SMTP rules for sending mail to FreeBSD
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Cc: lewiz <purple@lewiz.info>, Harry Tabak <htabak@quadtelecom.com>,
	freebsd-questions@FreeBSD.ORG
To: "Greg 'groggy' Lehey" <grog@FreeBSD.ORG>
From: John Martinez <rolnif@mac.com>
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On Saturday, December 28, 2002, at 04:22  PM, Greg 'groggy' Lehey wrote:

>
> No, this means that your DNS is flaky.  As somebody observed, this is
> a transient error.  Your MTA retries about every 30 minutes for about
> 5 days, and sooner or later the reverse lookup succeeds, and your mail
> is delivered.
>

I just change my sendmail config (the .mc file) to send a resolvable 
domain name in the EHLO/HELO part of the SMTP conversation. I use an 
unresolvable domain name inside of my home network, and my mail server 
is internal, so of course servers like FreeBSD's would reject my 
hostname as unresolvable.

If you're using sendmail, check out "confDOMAIN_NAME".

-john


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