Maybe a play on sendmail? Sendmuchmail?

Here is two suggestions based on translations of the word "postman";

postino: Italian postacı: Turkish

slight variations of what has mostly been said: ilpostino, mailman (there is GNU Mailman though..), postmen, postmann !

I prefer simple names like postal or mailer.

goingpostal (also a Terry Pratchett book)

Pat

Dispatch

spam-template-engine

Aeromail

Ghostman

postmaster