4.2 lost mail

[Alan Parker]

Is anyone aware of a problem that causes local mail not to be delivered
on a 4.2 system.    Once a week or so, I receive a report from someone
who is sure that local mail was not delivered.  No error indication is
returned to the sender and no trace of the message can be found.   I've
confirmed a few cases, so I'm sure that all cases are not user errors.
Any ideas?

-Alan