On Tue, 10 Feb 2004, Pete Weiss wrote:

>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)).

How does this user read/send email? I use Comcast.net at home. One option
that Comcast.net subscribers have is to access their email via the web.
In the web interface, there's an option to mark incoming mail as spam.
That option is also present in some email clients such as Mail.app that
comes with Mac OS X. I know I accidently marked mail as spam and then from
that point on, new email from the same source got placed in my junk
folder. Perhaps the same thing is happening with this subscriber.