[Mailman-Users] some mailing list members not getting emails

[Stephen J. Turnbull]

nigel white writes:

 > Some of my Mailman mailing list members are not getting the emails
 > that the other members are receiving. Do you have any idea what
 > could be involved here, and where I should look for the source of
 > the issue?

Mail is a very complex system, many things could be involved.

"Tracing", rather than guessing what the problem is, is the best way
to go about it.  First, check the Mailman logs (bounce, smtp,
smtp-failure are the obvious candidates).  Try to correlate events
with the addresses you know are valid but not receiving some posts.
Then you want to look at the SMTP logs for your MTA.  If nothing is
amiss there, it's quite possibly spam filtering at the remote host,
and your users will have to complain to their ISPs in most cases.
Some large ISPs have special staff to deal with this kind of problem,
though.

See also the FAQ which has at least a couple of entries dealing with
apparent non-delivery.