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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.
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