diff --git a/readme.md b/readme.md
index 3d715af..6f465c8 100644
--- a/readme.md
+++ b/readme.md
@@ -12,6 +12,7 @@ Four environment variables are used to configure the container:
 * `SMARTHOST_PASS`: Password for smarthost.
 * `LOCALMAILNAME`: The domain name which shall be used as the domain part of the sender address in every outgoing mail. If not required, skip it.
 * `RELAYNETS`: Networks exim in this container accepts for relaying. Separate multiple networks by semicolon.
+* `WHITELISTED_RECIPIENT`: Colon-separated list of whitelisted recipient domains, if empty no recipient restrictions will be applied
 
 
 ## Deployment
@@ -24,7 +25,7 @@ Typically, don't expose the smtp port of this container to the default network o
 ```
 #!/bin/bash
 
-IMAGE=quay.io/wollud1969/exim-docker:0.2.2
+IMAGE=quay.io/wollud1969/exim-docker:0.3.2
 MAILER_NETWORK=mailer-network
 
 docker network create $MAILER_NETWORK || echo "mailer-network already exists"
@@ -38,6 +39,7 @@ docker run \
   -e SMARTHOST=smarthost.example.com \
   -e LOCALMAILNAME=krohne.com \
   -e RELAYNETS=$RELAYNETS \
+  -e WHITELISTED_RECIPIENT="example-recipients.com" \
   --network $MAILER_NETWORK \
   --name mailer \
   --restart always \