Subject: mail doesn't deliver

From: Glenn Ferren <[email-masked]>
Date: Thu, 9 Nov 1995 10:59:07 -0700

Subject: returned mail: Cannot send message for three days.
(one of the msgs associated with undeliverable pine/unix mail)
Another is "not a local host"...

Where would I begin to look to determine the cause of failed deliveries to 
local and wan addresses...hosts on my subnet and hosts on other corporate 
subnets?  The addresses are good and can be pinged.
Appreciate any pointers.