They appear to be consolidating their mail servers to a new center
(maybe regionally, maybe nationally--I didn't inquire), and in the
process of doing so are installing new servers and new software,
requiring considerable effort to get everything up and running smoothly.
So yesterday morning, I tried to post a message to a mailing list, but
the message didn't show up. Tried again. No dice. Sent it to myself (on
two different accounts). No message. Other test messages went through,
though, and I was able to send and receive all other messages.
Corresponded with the other individuals I'd tried to send the same
message to and they never got it, although they immediately received the
message asking about it. Hmmm.
Well, my post was rather curmudgeonly, and so I signed it "D*** the
curmudgeon" (but with my name spelled out).
Okay, run a test: So I posted again, with the signature deleted. Sure
enough, it posted instantly and the private recipients got it too.
Time to call Comcast. It's a "known issue"--sort of. They were aware
that some people posting through their webmail interface were having
such problems and were investigating that path, but I was the first to
report the problem posting through a standard mail client. I pointed out
that the webmail messages were of necessity going through the same SMTP
server software as the mail client messages. The tech I was speaking
with thought that was new information (at least to him).
Anyway, just something to be aware of in case you are in the habit of
using such dirty words as my name in a post.
They're working on it.
D***