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+.TH s/qmail: srsreverse 1
+.SH NAME
+srsreverse \- reconstruct the original address from its SRS extension 
+and forward bounce mail
+.SH SYNOPSIS
+in
+.BR .qmail :
+.B |srsreverse
+.SH DESCRIPTION
+Upon reception by
+.BR qmail-smtpd ,
+.B qmail-local
+may feed a locally delivered bounce email through
+.B srsrevers
+in order to reconstruct the original sender from
+the received SRS address provided in the local part
+and to forward the bounce mail to its original address.
+.SH "SRS DOMAINS"
+In order to accept emails for SRS modified
+return addresses, you need to setup those in
+.IR rcpthosts .
+If your domain is
+.I example.com
+in
+.I rcpthosts
+you probably want to set up additionally
+.IR srs.example.com .
+However, 
+.I .example.com
+would be fine as well.
+.SH "VIRTUAL SRS USER"
+SRS can facilitate a virtual user typically named
+.I srs
+and thus requires an entry like
+.I srs.example.com:srs 
+in
+.IR virtualdomains .
+.SH "DOT QMAIL"
+.B srsreverse
+is called from a 
+.I dot-qmail
+file which could be
+.IR SQMAIL/alias/.qmail-srs-default .
+.SH "CONTROL FILES"
+.B srsreverse
+reads the control file 
+.I virtualdomains
+to exfiltrate the (virtual) SRS user name for the received domain, 
+if given. With the evaluated
+.IR srsdomain ,
+.B srsrevers
+fetches the
+.I SRS secret
+from 
+.I srsdomains 
+in order to validate the SRS bounce address.
+.SH "ENVIRONMENT VARIABLES"
+.B srsrverse 
+reads the environment variables
+.IR DTLINE ,
+.IR HOST ,
+and
+.IR RECIPIENTS .
+.I HOST 
+is used to determine the 
+.IR srsdomain .
+The forwarding bounce address is reconstructed from
+the local part of 
+.IR RECIPIENTS .
+.SH VERP
+The Sender Rewriting Scheme SRS can be considered 
+as tailored form of VERP: Variable Envelope Return Path. 
+The chosen primary delimiter
+.I =
+is recognized by 
+.BR qmail-smtpd 's
+recipient extension.
+.SH REFERENCE
+.B srsreverse 
+uses srs2.c from
+.IR libsrs2 .
+.SH "SEE ALSO"
+srsforward(1),
+dot-qmail(5),
+qmail-command(8),
+qmail-queue(8), 
+qmail-send(8).