scam-backscatter milter

Scam-backscatter prevents spam backscatter (accept and bounce) on
mail servers which don't host mailboxes locally. It validates
mailboxes by verifying the recipient addresses hosted on a different
mail server.

WWW: http://www.elandsys.com/scam/scam-backscatter/

PR: ports/147115
Submitted by: Janne Snabb <snabb@epipe.com>