I run several library related professional discussion lists.  I have
around 100 subscribers at the U.S. Library of Congress.  Since a few weeks
ago, LC (loc.gov) has been rejecting all of my private mail from
[log in to unmask] to my subscribers who have written me about list problems.
I cannot even contact the listowner of several lists at loc.gov, even
though he thought that he was exempt from all filtering (i.e. blacklist/
whitelist, etc.); he now knows different.  He also doesn't know what the
problem is, but thinks it is blacklisting (I don't think he runs the
email system at LC).

Could someone take a look at the error message below and give advice as
to what the problem is, and what might need to be done to correct it?
I haven't tried [log in to unmask] yet as my experience with "postmaster"
addresses is that if the item doesn't bounce (no such address) whatever
I send is studiously ignored, never a reply (wasn't like that 15 years
ago, but ....).

I have this problem only with loc.gov, so far.  I can send to anyone at
LC from my accounts at the U. at Buffalo, but that's a workaround, I need
to be able to send from ccsi.com.  Any advice appreciated.

Douglas Winship    [log in to unmask]


---------- Forwarded message ----------
Date: Thu, 29 Dec 2005 14:43:01 -0600 (CST)
From: Mail Delivery Subsystem <MAILER-DAEMON>
To: [log in to unmask]
Subject: Returned mail: see transcript for details

The original message was received at Wed, 28 Dec 2005 14:38:06 -0600 (CST)
from infinity.ccsi.com [216.236.168.2] (may be forged)

   ----- The following addresses had permanent fatal errors -----
<[log in to unmask]>
    (reason: 451 4.1.8 Domain of sender address [log in to unmask] does not
resolve)

   ----- Transcript of session follows -----
 ... while talking to sun8.loc.gov.:
>>> DATA
<<< 451 4.1.8 Domain of sender address [log in to unmask] does not resolve
<[log in to unmask]>... Deferred: 451 4.1.8 Domain of sender address
[log in to unmask] does not resolve
<<< 503 5.0.0 Need RCPT (recipient)
Message could not be delivered for 1 day
Message will be deleted from queue