#define EPIPE 32 /* Broken pipe */
Scam-backscatter prevents 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.
Backscatter is a serious side effect of SPAM if a secondary mail server does not have knowledge of acceptable recipient addresses of the primary mail server. Nowadays most of the SPAM uses forged sender addresses and SPAM backscatter causes a significant problem to innocent third parties whose address have been used in a SPAM campaign. This milter transparenly prevents your sendmail based secondary mail server from accepting messages which can not be delivered to the primary mail server.
There is now a FreeBSD port available. Check out your /usr/ports/mail/scam-backscatter directory or visit the FreshPorts page.
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EPIPE Communications assumes no responsibility whatsoever regarding the contents of this directory.