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.TH POSTSRSD "8" "May 2024" "postsrsd"
.SH NAME
PostSRSd \- Sender Rewriting Scheme daemon for Postfix
.SH SYNOPSIS
.B postsrsd
\fI\,\-s<file> \-d<domain> \/\fR[\fI\,other options\/\fR]
.SH DESCRIPTION
Sender Rewriting Scheme implementation for Postfix.
.PP
The Sender Rewriting Scheme (SRS) is a technique to forward
mails from domains which deploy the Sender Policy Framework (SPF)
to prohibit other Mail Transfer Agents (MTAs) from sending mails
on their behalf. With SRS, an MTA can circumvent SPF restrictions
by replacing the envelope sender with a temporary email address from
one of their own domains. This temporary address is bound to the
original sender and only valid for a certain amount of time, which
prevents abuse by spammers.
.SH OPTIONS
.TP
\fB\-h\fR
show help
.TP
\fB\-C\fR<file>
load configuration from <file> (default: /usr/local/etc/postsrsd.conf)
.TP
\fB\-c\fR<dir>
use <dir> as chroot directory (default: /usr/local/var/lib/postsrsd)
.TP
\fB\-D\fR
daemonize by forking into background
.TP
\fB\-p\fR<file>
write PostSRSd process ID into <file>
.TP
\fB\-u\fR<user>
drop root privileges and run as <user> (default: nobody)
.TP
\fB\-v\fR
show version number
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