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From: jordan@ucb-arpa.ARPA (Jordan M. Hayes)
Newsgroups: net.mail.headers
Subject: Re:  Can a user \"prod\" a remote host?
Message-ID: <4192@brl-smoke.ARPA>
Date: Fri, 26-Sep-86 21:04:00 EDT
Article-I.D.: brl-smok.4192
Posted: Fri Sep 26 21:04:00 1986
Date-Received: Tue, 30-Sep-86 08:25:34 EDT
Sender: news@brl-smoke.ARPA
Lines: 10

A lot of places and mailers _do_ check the inbound address for
correctness, but there's nothing stopping me from being on the machine
I claim I am, but asking for mail that the other end hasn't gotten
around to delivering yet -- if the load is high enough on ucbvax, and
mail comes in that needs to go to xx.lcs.mit.edu, it will get queued
...  in the interim, i go to xx.lcs.mit.edu and telnet to port 25 on
ucbvax and give a turn ... sendmail on ucbvax says "oh, ok -- here's
your bloody mail" and I get it all ... I repeat -- not _too_ cool.

/jordan