+SRS (Sender Rewriting Scheme) Support (using libsrs_alt)
+--------------------------------------------------------------
+See also above, for an alternative native support implementation.
+
+Exim currently includes SRS support via Miles Wilton's
+libsrs_alt library. The current version of the supported
+library is 0.5, there are reports of 1.0 working.
+
+In order to use SRS, you must get a copy of libsrs_alt from
+
+https://opsec.eu/src/srs/
+
+(not the original source, which has disappeared.)
+
+Unpack the tarball, then refer to MTAs/README.EXIM
+to proceed. You need to set
+
+EXPERIMENTAL_SRS_ALT=yes
+
+in your Local/Makefile.
+
+The following main-section options become available:
+ srs_config string
+ srs_hashlength int
+ srs_hashmin int
+ srs_maxage int
+ srs_secrets string
+ srs_usehash bool
+ srs_usetimestamp bool
+
+The redirect router gains these options (all of type string, unset by default):
+ srs
+ srs_alias
+ srs_condition
+ srs_dbinsert
+ srs_dbselect
+
+The following variables become available:
+ $srs_db_address
+ $srs_db_key
+ $srs_orig_recipient
+ $srs_orig_sender
+ $srs_recipient
+ $srs_status
+
+The predefined feature-macro _HAVE_SRS will be present.
+Additional delivery log line elements, tagged with "SRS=" will show the srs sender.
+For configuration information see https://github.com/Exim/exim/wiki/SRS .
+
+
+
+