I'm testing a particular issue pertaining to SMTP for a client (the
issue is irrelevant) and I have been sending huge amounts of mail
between two SMTP hosts. The irritating thing that I am running into is
that every time the servers receive a message to root I get a new mail
notification on every root shell I have open to the system:

New mail for root at slackware102 has arrived:
----

This gets irritating in a big hurry when I fire off a script that
generates 40000 messages and I'm trying to look at other things as
root. I know there are ways to work around this (sending mail to
another user, sudo, etc.), but I would prefer to just suppress the
messages if possible. I tried googling this and didn't find anything
useful, I'm not even sure what service is responsible for printing the
messages.

Cheers,