Date: 26 May 1996 11:21:47 -0000
Message-ID: <19960526112147.7804.qmail@koobera.math.uic.edu>
From: djb@koobera.math.uic.edu (D. J. Bernstein)
To: drums@cs.utk.edu
Subject: Re: 821bis outstanding issues list

> Delivered-To: tries to catch the following type of loop:

Right---a ``post-delivery loop'' in the language of RFCLOOPS. This is
also what EXPN supposedly helps you catch.

The other type of loop is a ``pre-delivery loop,'' where the important
tools are (1) proper MX handling and (2) proper handling of bounces.
This has nothing to do with EXPN.

> a@A mails to b@B. b@B is an alias for c@C. c@C is an alias for d@B.

As soon as you say ``alias'' you're talking about post-delivery events.

---Dan