according to the info you posted
<ereg...@stlawu.edu>:
mx2.stlawu.edu [199.0.76.10]:
RCPT TO:<ereg...@stlawu.edu>
<<< 450 Client host rejected: cannot find your hostname,
[208.31.125.250]
the remote server mx2.stlawu.edu apparently running postfix cannot resolve your
hostname from your ip address 208.31.125.250 and it has chosen not to deliver
mail from ip addresses that it cannot look up. Since it returned a temporay
error (450) it stays in your mail queue where your mail server attempts to
deliver for the default time of 1 week, at which point it gives up and becomes
undeliverable.
---- Original Message ----
From: Michael Weil
To: cour...@lists.sourceforge.net
Sent: Tuesday, June 29, 2004 4:07 PM
Subject: [courier-users] Courier error message meaning?
With one potential recipient of mail from a local user, we
consistently get error messages and returned mail.
To the best of my knowledge, the recipient gets all mail from other
sources and we get no
returned mail from other sources.
This last email reject took 7 days to become "undeliverable". Any
ideas?
UNDELIVERABLE MAIL
Your message to the following recipients cannot be delivered:
<ereg...@stlawu.edu>:
mx2.stlawu.edu [199.0.76.10]:
RCPT TO:<ereg...@stlawu.edu>
<<< 450 Client host rejected: cannot find your hostname,
[208.31.125.250]