diff --git a/Dockerfile b/Dockerfile
index ec2cf51..34b3446 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,4 +2,4 @@ FROM alpine:3
 
 CMD ["/usr/sbin/postfix", "-c", "/etc/postfix", "start-fg"]
 
-RUN apk --no-cache add postfix postfix-ldap cyrus-sasl-login
+RUN apk --no-cache add postfix postfix-ldap cyrus-sasl-login mlmmj