[Asterisk-Users] what is the problem with gmail and the list.

[Gary Reuter]

I do not think the problem with the lists since sometime July 29th was
specific to Gmail...
If you check the web archives, you'll see both regular posts and
others (non-Gmail) asking about problems.
My best guess is a subscriber's domain expired or some other similar
problem which clogs mailserver queues.  Hopefully the list admin will
post an update once the problem is solved.