this is NOT critical and is only personal preference. I tend to have my
firewalls set on something like "router.example.local". However, when I
put in the sender e-mail address as "root(a)router.example.local" it is
rejected as an invalid e-mail address.

Maybe this is by designed; some spam filters will reject mail with a
From: that uses .local as a TLD. If so, ignore this.
-- 
Rod Rodolico
Daily Data, Inc.
POB 140465
Dallas TX 75214-0465
214.827.2170
http://www.dailydata.net