Being a Comcast customer myself, I know that they use Brightmail filtering and that there is a customer control for which messages get blocked and which ones are allowed.

I think Brightmail has an issue with null From lines used with Listserv status messages.

andrew


>>> [log in to unmask] 2/10/2004 8:19:17 AM >>>
We have an off-campus subscriber on the COMCAST ISP who is now having
difficulties mailing our list.  He is neither served off nor blocked by
our ISP.  He's able to email me, as well as the
[log in to unmask] address, but his mailer seems to block the
[log in to unmask]  Oh, the listname is ab-L (a total of four
positions including the dash (ab-L is NOT the real listname)).

 > From: Mail Delivery Subsystem [mailto:[log in to unmask]] 
 > Sent: Tuesday, February 10, 2004 8:44 AM
 > To: [log in to unmask] 
 > Subject: Returned mail: delivery problems encountered
 >
 >
 > A message (from <[log in to unmask]>) was received at 10 Feb
 > 2004 13:43:30 +0000.
 >
 > The following addresses had delivery problems:
 >
 > <[log in to unmask]>
 >      Permanent Failure: Other address status
 >      Delivery last attempted at Tue, 10 Feb 2004 13:44:04 -0000