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+Mail Address Verification (MAV)
+===============================
+
+Introduction
+------------
+
+Mail Address Verification (MAV) makes the
+'Mail From:' envelope sender address authoritive.
+This is facilitated by comparing the received 
+'Mail From:' address in the SMTP dialoge, with a list
+of addresses/domains included in a list matching
+
+(1) the userid (=> $TCPREMOTEINFO).
+(2) the IP (=> $TCPREMOTEIP),
+(3) the FQDN (=> $TCPREMOTHOST),
+
+of the connecting SMTP client to qmail-smtpd.
+
+
+MAV invocation
+--------------
+
+Use the evironment variable 'LOCALMFCHECK' by
+means of the qmail-smtpd start script or by means
+of tcpserver's cdb file with the following definitions:
+
+(1) LOCALMFCHECK="" - unqualified checking against 
+    control/rcpthosts
+(2) LOCALMFSCHECK="!" - qualified checking against
+    control/mailfromrules.cdb
+(3) LOCALMFCHECK="example.com" - qualified checking
+    with fixed name 
+
+
+MAV database
+------------
+
+Include into the file contol/mailfromrules
+a list of assigned senders and designated 'Mail From:' 
+addresses in the following format:
+
+12.34.56.:@example.com
+12.34.56.78:jffy@example.com,fred@noexample.com
+=example.com:@example.com
+joe@example.com:joe.stein@example.com
+
+ 
+Note 1: The addresses are included in a tcpserver
+compatible format.
+
+Note 2: The length of the assigned email 'Mail From:'
+addresses is only limited by memory.
+
+Note 3: All assigned 'Mail From:' addresses have to
+include a '@'. Checks are done for spaces. Comments
+are allowed.
+
+Note 4: All addresses are evaluated in lower case.
+
+
+Run bin/qmail-mfrules to construct control/mailfromrules.cdb
+out of control/mailfromrules.
+
+
+Return codes
+------------
+
+In case, the match was not successful, the sending MTA
+client receives the following message:
+
+"553 sorry, invalid sender address specified (#5.7.1)"
+
+The message can be customized by means of the environment 
+variable REPLYMAV="texstring" including 'textstring' between
+'specified' and the EMSSC code.
+
+
+Others information
+------------------
+
+Read PROPOSAL.mav.
+
+Read man qmail-mfrules.
+Read man qmail-smtpd.
+Read man qmail-control.
+Perform qmail-showctl.
+
+
+Erwin Hoffmann, Cologne 2005-04-26.
+
+
+
+
+
+
+