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-.TH s/qmail: qmail-postgrey 8
-.SH NAME
-qmail-postgrey \- send SMTP connection data to greylisting server
-.SH SYNOPSIS
-.B qmail-postgrey ip%netid;port Mail From: Rcpt To: TCPREMOTEIP TCPREMOTEHOST
-.SH DESCRIPTION
-.B qmail-postgrey
-is usually invoked by
-.B qmail-smtpd
-automatically provissioning the SMTP connection information
-.IR Mail\ From: ,
-.IR Rcpt\ To: ,
-.IR TCPREMOTEIP 
-and
-.I TCPREMOTEHOST
-to a greylising server given by
-.IR IPv4|IPv6%netid;port .
-.I port
-defaults to 
-.I 60000
-and thus can be omitted. 
-IPv6 LLU addresses can be specified
-adding the 
-.I netid 
-name following the percentage sign.
-.SH "GREYLISTING SERVER"
-Since there is neither a formal API defined for the
-greylisting lookup nor for the behavior and return
-codes of the greylisting server, 
-.B qmail-postgrey
-only works well with
-.I David\ Schweikert's
-.B postgrey
-implementation.
-
-Here, the server's response upon recognizing the triple
-.RI CLIENT_IP ,
-.I (SMTP\ envelope)\ SENDER
-and 
-.I (SMTP\ envelope)\ RECIPIENT
-is either
-.IR action=DUNNO ,
-.I action=PREPEND
-or
-.I action=DEFER_IF_PERMIT
-and in case of the last,
-.B qmail-postgrey
-returns with
-.I 10
-telling 
-.B qmail-smtpd
-to respond to the client with a SMTP
-.I 450\ greylisted
-reply code. Otherwise
-.B qmail-postgrey
-returns
-.IR 0 .
-.SH "INVOCATION"
-Unlike for testing reasons,
-.B qmail-postgrey
-is called directly from 
-.B qmail-smtpd
-in case the environment variable
-.I POSTGREY
-is defined and provissioned with the greylisting 
-server's IP address (and perhaps netid and port)
-listening there.
-
-The environment variable
-.I POSTGREY
-is typically defined within
-.B sslserver\'s
-.IR cdb .
-Additionally, 
-.I REPLY_GREYLISTED
-can be used as environment variable 
-to provide some more descriptive
-information to the sending MTA which will eventually
-be visible in a bounce message. 
-.SH "CREDITS"
-.B qmail-postgrey 
-and its integration into 
-.B qmail-smtpd
-is based on 
-.I Jan\ Mojzis
-implementation and used by permission.
-.SH "SEE ALSO"
-qmail-control(5),
-qmail-smtpd(8),
-https://postgrey.schweikert.ch