Date: Mon, 12 May 1997 09:50:07 +0800 (HKT) From: John Beukema <john@packfish.gateway.net.hk> To: Dev Chanchani <dev@wopr.inetu.net> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: Sendmail hack Message-ID: <Pine.BSI.3.91.970512094844.13597A-100000@packfish.gateway.net.hk> In-Reply-To: <Pine.BSF.3.95q.970511185824.21995A-100000@wopr.inetu.net>
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On Sun, 11 May 1997, Dev Chanchani wrote: > I and my users have been receiving a lot of spam mail recently. Usually, > this is not so bad because I will just reply to remove me. However, more > and more spammers are using fake domain names to send their spam from. I > was wondering if you could hack sendmail to do a lookup on the reply to or > from address. If the domain name is non-existant, reject the mail. > > For example: > mail coming from: joe@schmoe.com would be accepted because the domain name > exists (need not really resolve it). > > mail coming from: joe@non-existant.com would be rejected because > non-existant.com is not in the whois database. > How do you stop spammers who use an existing address which is not theirs? jbeukema > Anyone have any ideas? > > > >
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