I run a list on ua1vm.  I've recently have started getting mail from some
users stating "I have not received mail for over a week....".  The only
thing they seem to have in common is is the domain "ac.uk".  One node
is "lshtm.ac.uk" while a second is "ccn2.ccn.nottingham.ac.uk".  I have
scanned my error account and nothing from those sites shows up.  The
list entry for them is ok (one to digest, one to mail)
 
Anyone give suggestions on where to look now?  I'm at a loss.
 
Tia.
 
-- jf