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Smtptrapd

May 26, 2018

RFC 2821 compliant SMTP service that always returns a 4xx soft error

The smtptrapd program is a multi-threaded daemon that provides a RFC 2821 compliant SMTP service that always returns a 4xx soft error to the RCPT TO verb. Use it to keep spammers who try to exploit the MX with highest PRI away.

WWW http//smtptrapd.sourceforge.net/