cryptoanarchy.wiki

Arise, you have nothing to lose but your barbed wire fences!

1994-11-28 - Re: How to disable telnet to port 25

Header Data

From: “Perry E. Metzger” <perry@imsi.com>
To: cypherpunks@toad.com
Message Hash: cd629e80b143658744d8050eab2ba32bf3221269e91446d3dcdee864efa6a6a5
Message ID: <9411280047.AA10945@snark.imsi.com>
Reply To: <9411272312.AA03124@anon.penet.fi>
UTC Datetime: 1994-11-28 00:47:42 UTC
Raw Date: Sun, 27 Nov 94 16:47:42 PST

Raw message

From: "Perry E. Metzger" <perry@imsi.com>
Date: Sun, 27 Nov 94 16:47:42 PST
To: cypherpunks@toad.com
Subject: Re: How to disable telnet to port 25
In-Reply-To: <9411272312.AA03124@anon.penet.fi>
Message-ID: <9411280047.AA10945@snark.imsi.com>
MIME-Version: 1.0
Content-Type: text/plain



The Al Capone of the Info Highway says:
> A while back, there was a discussion about how to fake a from
> address by telneting into port 25 in a site. Many people discussed
> the pro's and cons, but I wanted to know if anybody knows of a way
> to stop people from getting in there to send the message in the
> first place.

Sure. Turn off mail to your site.

Beyond that, the store and forward nature of mail makes it impossible
to stop this. The only real solution is to require digital signatures
on all email.

Perry

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