On Tue, 24 Sep 2002 17:24:27 -0500, John Traweek
<[log in to unmask]> wrote:

>The problem is they are reporting 554, so at that point LSMTP
>bounces the message instead of retrying.

The theory of SMTP error codes (see RFC821) requires this of any/all mail
transfer agent programs, including LSMTP.  5xx errors are classified as
'permanent' meaning retry will most likely not succeed.  The descriptive
text after the 554 may offer slightly more of a clue.

>I wonder if they are now filtering this at the SMTP
>protocol level?

Nothing wrong with the protocol.  They may be blocking the IP address of
your server, or it may simply be a screwup on the part of Hotmail.  Hotmail
could be giving the wrong error code for the situation, but LSMTP/LISTSERV
would have no way to know that.