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From: "Jonathan M. Bresler" <jmb>
Message-Id: <199803192359.PAA03815@hub.freebsd.org>
Subject: Re: spam blocking in sendmail
In-Reply-To: <3511A033.6A780275@launchpad.win.net> from Joe Mays at "Mar 19, 98 05:46:11 pm"
To: jfmays@launchpad.win.net (Joe Mays)
Date: Thu, 19 Mar 1998 15:59:15 -0800 (PST)
Cc: freebsd-isp@FreeBSD.ORG
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Joe Mays wrote:
> On a related note: I just ran into an issue today with
> spammers that leads me to a sendmail.cf question.
> 
> Someone out there is generating spam mail (we've encountered
> it from more than one domain) that has a blank X-UIDL:
> header.  This is a real problem for MS Outlook and Outlook
> express.  When they attempt to download messages from the
> pop server which contain this header they hang and give a
> pop-server timeout.  Netscape has no problem downloading
> them, though it may screw up the indexing in the inbox list,
> not sure about that yet.
> 
> In the strictest sense this is an MS Outlook problem.  The
> blank X-UIDL header should not halt the download.  In the
> real world, it looks to our customers as though our pop
> server is dying.  Does anyone know if it is possible to have
> a sendmail.cf ruleset that watches for empty X-UIDL headers
> and bounces them if they occur.

	i do not know of any way of doing this in the current
	version of sendmail.   sendmail 8.9.0, which is now in
	beta, *may* be able to do this.

	procmail definately can hanlde this problem.
jmb

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