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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" spfd \- simple forking daemon to provide SPF query services .SH "VERSION" .IX Header "VERSION" 2006\-02\-07 .SH "SYNOPSIS" .IX Header "SYNOPSIS" \&\fBspfd\fR \fB\-\-port\fR \fIport\fR [\fB\-\-set\-user\fR \fIuid\fR|\fIusername\fR] [\fB\-\-set\-group\fR \&\fIgid\fR|\fIgroupname\fR] .PP \&\fBspfd\fR \fB\-\-socket\fR \fIfilename\fR [\fB\-\-socket\-user\fR \fIuid\fR|\fIusername\fR] [\fB\-\-socket\-group\fR \fIgid\fR|\fIgroupname\fR] [\fB\-\-socket\-perms\fR \fIoctal-perms\fR] [\fB\-\-set\-user\fR \fIuid\fR|\fIusername\fR] [\fB\-\-set\-group\fR \fIgid\fR|\fIgroupname\fR] .PP \&\fBspfd\fR \fB\-\-help\fR .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBspfd\fR is a simple forking Sender Policy Framework (\s-1SPF\s0) query proxy server. spfd receives and answers \s-1SPF\s0 query requests on a \s-1TCP/IP\s0 or \s-1UNIX\s0 domain socket. .PP The \fB\-\-port\fR form listens on a \s-1TCP/IP\s0 socket on the specified \fIport\fR. The default port is \fB5970\fR. .PP The \fB\-\-socket\fR form listens on a \s-1UNIX\s0 domain socket that is created with the specified \fIfilename\fR. The socket can be assigned specific user and group ownership with the \fB\-\-socket\-user\fR and \fB\-\-socket\-group\fR options, and specific filesystem permissions with the \fB\-\-socket\-perms\fR option. .PP Generally, spfd can be instructed with the \fB\-\-set\-user\fR and \fB\-\-set\-group\fR options to drop root privileges and change to another user and group before it starts listening for requests. .PP The \fB\-\-help\fR form prints usage information for \fBspfd\fR. .SH "REQUEST" .IX Header "REQUEST" A request consists of a series of lines delimited by \ex0A (\s-1LF\s0) characters (or whatever your system considers a newline). Each line must be of the form \&\fIkey\fR\fB=\fR\fIvalue\fR, where the following keys are required: .IP "\fBip\fR" 4 .IX Item "ip" The sender \s-1IP\s0 address. .IP "\fBsender\fR" 4 .IX Item "sender" The envelope sender address (from the \s-1SMTP \s0\f(CW\*(C`MAIL FROM\*(C'\fR command). .IP "\fBhelo\fR" 4 .IX Item "helo" The envelope sender hostname (from the \s-1SMTP \s0\f(CW\*(C`HELO\*(C'\fR command). .SH "RESPONSE" .IX Header "RESPONSE" spfd responds to query requests with similar series of lines of the form \&\fIkey\fR\fB=\fR\fIvalue\fR. The most important response keys are: .IP "\fBresult\fR" 4 .IX Item "result" The result of the \s-1SPF\s0 query: .RS 4 .IP "\fIpass\fR" 10 .IX Item "pass" The specified \s-1IP\s0 address is an authorized mailer for the sender domain/address. .IP "\fIfail\fR" 10 .IX Item "fail" The specified \s-1IP\s0 address is not an authorized mailer for the sender domain/address. .IP "\fIsoftfail\fR" 10 .IX Item "softfail" The specified \s-1IP\s0 address is not an authorized mailer for the sender domain/address, however the domain is still in the process of transitioning to \&\s-1SPF.\s0 .IP "\fIneutral\fR" 10 .IX Item "neutral" The sender domain makes no assertion about the status of the \s-1IP\s0 address. .IP "\fIunknown\fR" 10 .IX Item "unknown" The sender domain has a syntax error in its \s-1SPF\s0 record. .IP "\fIerror\fR" 10 .IX Item "error" A temporary \s-1DNS\s0 error occurred while resolving the sender policy. Try again later. .IP "\fInone\fR" 10 .IX Item "none" There is no \s-1SPF\s0 record for the sender domain. .RE .RS 4 .RE .IP "\fBsmtp_comment\fR" 4 .IX Item "smtp_comment" The text that should be included in the receiver's \s-1SMTP\s0 response. .IP "\fBheader_comment\fR" 4 .IX Item "header_comment" The text that should be included as a comment in the message's \f(CW\*(C`Received\-SPF:\*(C'\fR header. .IP "\fBspf_record\fR" 4 .IX Item "spf_record" The \s-1SPF\s0 record of the envelope sender domain. .PP For the description of other response keys see Mail::SPF::Query. .PP For more information on \s-1SPF\s0 see . .SH "EXAMPLE" .IX Header "EXAMPLE" A running spfd could be tested using the \f(CW\*(C`netcat\*(C'\fR utility like this: .PP .Vb 11 \& $ echo \-e "ip=11.22.33.44\ensender=user@pobox.com\enhelo=spammer.example.net\en" | nc localhost 5970 \& result=neutral \& smtp_comment=Please see http://spf.pobox.com/why.html?sender=user%40pobox.com&ip=11.22.33.44&receiver=localhost \& header_comment=localhost: 11.22.33.44 is neither permitted nor denied by domain of user@pobox.com \& guess=neutral \& smtp_guess= \& header_guess= \& guess_tf=neutral \& smtp_tf= \& header_tf= \& spf_record=v=spf1 ?all .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" Mail::SPF::Query, .SH "AUTHORS" .IX Header "AUTHORS" This version of \fBspfd\fR was written by Meng Weng Wong . Improved argument parsing was added by Julian Mehnle . .PP This man-page was written by Julian Mehnle .