Add environment variable to allow for customizing postsrsd's SRS_EXCLUDE_DOMAINS setting (#849, #842)

README.md

@@ -486,3 +486,9 @@ Note: This postgrey setting needs `ENABLE_POSTGREY=1`
   - **empty** => No sasl_passwd will be created
   - string => `/etc/postfix/sasl_passwd` will be created with the string as password
 
+## SRS (Sender Rewriting Scheme)
+
+##### SRS_EXCLUDE_DOMAINS
+
+  - **empty** => Envelope sender will be rewritten for all domains
+  - provide comma seperated list of domains to exclude from rewriting

target/postsrsd-wrapper.sh

@@ -1,8 +1,12 @@
 #!/usr/bin/env bash
-# postsrsd-wrapper.sh, version 0.1.0
+# postsrsd-wrapper.sh, version 0.2.0
 
 DOMAINNAME="$(hostname -d)"
 sed -i -e "s/localdomain/$DOMAINNAME/g" /etc/default/postsrsd
 
+if [ -n "$SRS_EXCLUDE_DOMAINS" ]; then
+  sed -i -e "s/^#\?SRS_EXCLUDE_DOMAINS=.*$/SRS_EXCLUDE_DOMAINS=$SRS_EXCLUDE_DOMAINS/g" /etc/default/postsrsd
+fi
+
 /etc/init.d/postsrsd start