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Date:      Wed, 10 Oct 2001 23:23:09 -0700 (PDT)
From:      "Jeremy C. Reed" <reed@reedmedia.net>
To:        freebsd-advocacy@FreeBSD.ORG
Subject:   RE: advocacy/31194: freebsd.org mailing lists - configuration problem?
Message-ID:  <Pine.LNX.4.21.0110102313540.3559-100000@pilchuck.reedmedia.net>
In-Reply-To: <006301c15212$b17e06c0$1401a8c0@tedm.placo.com>

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On Wed, 10 Oct 2001, Ted Mittelstaedt wrote:

> This is an excellent point.  anti-spam rejects should always have error
> codes starting with a 5 otherwise the sending server requeues and continues
> to resend indefinitely, burning up your bandwidth.

Not indefinitely. This is configurable by most (all?) mail servers;
commonly, it is retried a few times a day for four days.

On Wed, 10 Oct 2001, Kris Kennaway wrote:

> On Wed, Oct 10, 2001 at 10:54:42AM -0700, Jeremy C. Reed wrote:

> > It seems like the mail server should not return a temporary error.

> This would be incredibly annoying in cases of transient DNS failure.
> For example, suppose FreeBSD's DNS server broke, so no hostnames could
> be resolved.  None of the incoming mail would be re-sent, and it would
> all be lost.

But all will not be lost. The sender should receive a (bounce) message
indicating the failure.

You have a good point.

I guess a 4xx is better than a 5xx. Either way the sender will eventually
be told that the message failed (due to the bad HELO hostname).

   Jeremy C. Reed
   http://www.reedmedia.net/



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