[Mailman-Users] some users not getting posted email message

[Jaswinder S. Hayre]

Guys,

For some reason some members don't get the posted email.  Our list server is
lists.nysia.org, but anyone that is registered with a *@nysia.org email
address does not get any emails from the list server.  There might be more
people, but I haven't identified (no one has complained that they aren't
getting it).  Any clue about what might be happening.  I believe this only
happens for one of the lists.  The list has about 5000 members.

Jas