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authorJannis Hoffmann <jannis@fehcom.de>2024-07-09 11:44:11 +0200
committerJannis Hoffmann <jannis@fehcom.de>2024-07-09 11:44:11 +0200
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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).