Sounds to me like the problem may well be in your mail program.  If
you are using OE lite, which seems likely on the Comcast system, check
TOOLS, then ACCOUNTS and look to see what return mail address is in
the PROPERTIES.  If the old address is still there, which was when I
changed my comcast data, the sender may be sending the old address
which is no longer recognized by the list configuration.

Just looking at this last mailing, I bet this is the problem.... hope
it helps.

Jim Hord

> There is no way this is a Comcast problem.  First of all I have
downloaded
> and installed Comcast software, months ago.  Secondly, I have spent
umpteen
> hundred hours on phone with Comcast to get switched over, also over
a period
> of 3 months.