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+.TH s/qmail: spfquery 8
+.SH NAME
+spfquery \- SPF test program 
+.SH SYNOPSIS
+.B spfquery
+.I sender-ip
+.I sender-helo
+.I envelope-from
+.I [local rules]
+.I [-v]
+.SH DESCRIPTION
+.B spfquery
+is a test program to allow evaluation
+of 
+.I SPF records
+fetched on demand by means of 
+.BR qmail-smtpd .
+
+.SH "ARGUMENTS"
+.B spfquery
+uses the given arguments
+.IR sender-ip ,
+.IR sender-helo ,
+and 
+.I envelope-from
+to perform a DNS SPF TXT lookup
+and evaluates the results. 
+In addition, \'local-rules\' might 
+be included as 
+.IR local-rules .
+By means of the (last) option
+.I -v
+a verbose output is provided. 
+
+.SH "RESPONSE"
+The result of 
+.B spfquery
+shows the SPF return codes of the retrieved
+information after the DNS evaluation.
+Additionally, the mechanisms and 
+results are displayed as chain 
+of resulting codes. In case the option
+.I -v
+is given, the received DNS SPF TXT records 
+for the analysed domain are shown in raw 
+format to allow further diagnostics.
+
+.SH "SPF MECHANISMS"
+.B spfquery
+and of course
+.B qmail-smtpd 
+support all mechanisms defined in 
+.IR RFC\ 7208 ,
+in particular: 
+.IR A/AAAA ,
+.IR IPv4 ,
+.IR IPv6 ,
+.IR MX ,
+.IR PTR ,
+.IR Exists .
+Nesting of SPF records - indicated by the commands
+.I include: 
+and
+.I redirect=
+- is allowed and the chain is followed.
+Further,
+.I exp(lanation)=
+is supported.
+
+.SH "SPF QUALIFIERS"
+SPF makes uses of command and explanation qualifiers.
+Command and explanation characters are:
+.I +
+pass (default),
+.I -
+fail,
+.I ~
+softfail,
+.I ? 
+neutral.
+
+.SH "EXPLANATION CHARACTERS"
+This implementation uses the following
+additional explanation characters:
+.I o
+none,
+.I u
+unknown,
+.I d
+DNS problem (not used).
+
+.SH "MACRO EXPANSION"
+Macros (keyword) expansion is supported conforming to
+.IR RFC\ 7208 .
+
+
+.SH "SPF EVALUATION"
+.B spfquery
+provides a brief summary of results for the evaluation:
+.I S
+the sending IP,
+.I O
+the envelope-from address,
+.I C
+the requested domain for lookup,
+.I H
+the HELO/EHLO of the contacted MTA,
+.I M
+the SPF lookup mechanis as explained,
+.I I
+the included domanin for lookup,
+.I D
+the (re)direct to follow,
+.I P
+a potential problem observed.
+These letters are followed by an equal sign '='
+and detail the information.
+.I R
+is the lookup result obtained, followed by a
+colon ':'.
+
+.SH "DIAGNOSTICS"
+Additional DNS diagnostic routines are available:
+.B dnstxt
+returns the DNS TXT for
+.IR host .
+.B dnsptr
+returns the DNS PTR for
+.IR IP .
+.B dnsmxip
+returns the MTA IPs for
+.IR domain .
+
+.SH "CREDITS"
+The 
+.B spfquery 
+program and the SPF integration into
+.B s/qmail
+follows mainly the implementation of
+Jana Saout (http://www.saout.de/misc/spf/)
+and is used by permission.
+
+.SH "SEE ALSO"
+qmail-control(5),
+qmail-smtpd(8)
+dnsmxip(8),
+dnstxt(8).