Date: Thu, 19 Mar 1998 17:46:11 -0500 From: Joe Mays <jfmays@launchpad.win.net> To: freebsd-isp@FreeBSD.ORG Subject: Re: spam blocking in sendmail Message-ID: <3511A033.6A780275@launchpad.win.net> References: <199803191812.KAA07542@hub.freebsd.org>
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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. Re: Outlook, if the header is present and has a value, that's fine. If it's not there at all, that's fine too. If it's there but has no value, hang-time. I'm not sure why a spammer would want to generate a message with the header like this. Jonathan M. Bresler wrote: > > Steve Hovey wrote: > > > > Ive found what looks like a good way to block inbound spam by domain - but > > am not up on sendmail enough - it mentions making a hash table > > > > > > FK/etc/mailspamdomains > > > > > > Is that just text you leave be? Or do you have to issue some kind of > > makemap on it? It doesnt mention doing anything - but I thought I would > > check. > > wow....that all depends upon what is in your sendmail.cf > FK/etc/mailspamdomains declares a database file called > /etc/mailspamdomains. nothing more. > > take a look at /etc/mail/sendmail.cf.additions > and /etc/mail/README. > > we use those anti-spam rules. > jmb > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-isp" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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