Date: Mon, 14 Jun 1999 17:41:55 -0500 (EST) From: Steve Ames <steve@cioe.com> To: berenmls@saers.com, leifn@neland.dk Cc: freebsd-isp@FreeBSD.ORG, Gary.Palmer@RCN.COM Subject: Re: Sendmail Message-ID: <199906142241.RAA06809@ns1.cioe.com> In-Reply-To: <Pine.BSF.4.05.9906142324210.48648-100000@arnold.neland.dk>
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> > >That just opens you up to unauthorized relaying, except that you make > > >the spammer make it look like it comes from your domain (on the from > > >line) which would just make people think that its authorized. > > > > This sounds WAAAY to black-and-white for me. :-I How have you ISP's out > > there solved the smtp-problem? How do your users use SMTP? > > > > Only allow relay from our own ip-groups. > > If somebody dials through another provider to fetch their mail, let the > user use that providers server to smtp. > > No problem... Roaming? A user who takes a notebook on vacation. Dialing a local ISP in Windows 95/98 is just a matter of typing a different number on the opening screen. To a normal user, changing your SMTP server is far more complex. A lot of ISPs are using 'POP before SMTP'. Rather kludgy in my opinion but it does the job until better options open up. In this scenario a user must attempt to retrieve email first. The pop server then updates a sendmail database of what IPs are allowed to relay. The IP address falls out X minutes after being allowed in. http://www.cynic.net/~cjs/computer/sendmail/poprelay.html is the best source for this info I think. -Steve To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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