Date: Wed, 30 Jul 1997 13:32:54 -0400 (EDT) From: Drew Derbyshire <ahd@kew.com> To: ahd@kew.com, devnull@gnu.ai.mit.edu Cc: andrew@python.shoal.net.au, freebsd-chat@FreeBSD.ORG, msmith@atrad.adelaide.edu.au Subject: Re: HOTMAIL.COM, JUNO.COM, etc.... Message-ID: <199707301732.NAA03773@pandora.hh.kew.com>
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> From devnull@gnu.ai.mit.edu Wed Jul 30 03:52:54 1997 > However, the cheaper it is is define a user id on a site, the more > likely it is is that a spammer will use it. Hotmail and Juno, being > free, makes them easy targets. > > Are you sure juno is free? I thought you paid like $5 a month. Dunno. I do know HotMail is free. > I actually accept mail only from such large sites when the mail > comes from a relay within the domain, and I also don't let their > relays send me mail from third party sites. Both rules cut down > on the SPAM, since mismatches indicate forged mail. (These rules > required a sendmail source hack ... *sigh*) > > So what happens if I set my address to devnull@gnu.ai.mit.edu, but > I send the message from some random dialup of some random ISP in Hawaii? > > Doesn't that mean my mail will get lost? If you use my little hack, no it will not get lost. Rather: If the ISP isn't on my short list of untrusted domains, it is accepted normally. If the ISP _is_ on my list, then your sender adress "devnull@gnu.ai.mit.edu" will get a standard bounce message explaining that mail from the ISP's relays must have the ISP's domain name in the sender address. (This assumes your ISP's mailer does the right thing with 571 errors from the remote SMTP site.) Note too that mail from a mailing list should also usually work, since the envelope sender is normally changed to the address of the mailing list bounce address. So a CIS post to FreeBsd-chat should still reach me, with a sender envelope of FreeBSD.org. The correct thing to do, BTW, is to use a sender address of your ISP and a From: and/or Reply-To: address of devnull@gnu.ai.mit.edu. Not that anyone bothers, including me. :-) Someone else asked if I'll share my hack, and I will, if ever get the comments in it cleaned up. -- Drew Derbyshire Internet: ahd@kew.com Kendra Electronic Wonderworks Telephone: 617-279-9812 "The bug is mightier than the fix." - Cyrano deBuggerac
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