smtpd/qpsmtpd — pull request #47 by luzluna (2014-05-30 06:23:59+00:00)
Title: stunnel proxy protocol remote ip,port setting feature added for smtps.

reference : http://www.stunnel.org/static/stunnel.html
protocol spec : http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt