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Date:      Sun, 29 Dec 2002 10:50:00 -0800
From:      John Martinez <>
To:        Len Conrad <>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: What are the SMTP rules for sending mail to FreeBSD
Message-ID:  <>
In-Reply-To: <>

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On Sunday, December 29, 2002, at 10:06  AM, Len Conrad wrote:

>> ISTR Postfix replies with 450 to (almost) all errors by default.
> And there are errors where you need to escalate the 4xx response to 
> 554 to stop the sending MTA from re-trying for days, or just harvest 
> the 4xx ip's to a new .map filean block with 554.
> Postfix's new "sender address verification" is extremely effective in 
> blocking crap that used to get through, but it always returns 4xx so 
> your reject counts go through the roof as SAV 4xx rejects are re-tried 
> 100's of times.  But, in fact, this is more of a resource consumption 
> for the senders than it is on your MX.  And the advantage of keeping 
> this crap out of your system outweighs the higher rate of repeated 
> rejects.

Sounds great. Maybe I'll convert to Postfix soon enough!


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