strange sendmail behavir

[Steven Stern]

I have root aliased to "webmaster at mydomain.com" in /etc/aliases.  When I
use "sendmail -bv root", it shows that the mail will be send to
"webmaster at mydomain.com".

But when I use "mail root", the mail goes to
"root at mylocalhost.mydomain.com".

Mail is handled by a SMARTHOST statement going out to a gmail mx server,
but the problem remains if I let it default to finding an MX on its own.

I'm baffled.
-- 
-- Steve