On Fri, 7 Nov 1997 05:47:09 EST, Elliott Parker
<[log in to unmask]> wrote:

>Has anybody seen an error as appended below?  What does it mean?
>  6 11/03 11/05 A. User <[log in to unmask]>
>                Last error: SMTP; 553 <[log in to unmask]>...
>                            Access Denied,name ULKYVM.LOUISVILLE.EDU unknown to
>                            DNS

This is a spam prevention tactic being instituted in many places.  The
receiving SMTP handler attempts a reverse DNS lookup on the From: address
in incoming mail.  If that fails (and Pete points out why it can in this
case, too many MX hosts, with tables slightly out of sync) then the mail is
rejected (but not always depending on which hosts are processing the mail
on that try).  This effort has the side-effect of slowing down incoming
mail by a good deal.

The user needs to complain to their ISP that legitimate mail is being
blocked.  Maybe BA can be forced into updating and synchronizing tables,
but I wouldn't hold my breath...  8-(
--
 ______________________________________________________________________
 Ben Parker .......... (Aurora, CO) ........... [log in to unmask]