diff --git a/puppet/zulip/files/postfix/virtual b/puppet/zulip/files/postfix/virtual
index 18218a7685..750259455d 100644
--- a/puppet/zulip/files/postfix/virtual
+++ b/puppet/zulip/files/postfix/virtual
@@ -1 +1,2 @@
 /.*\+.*@.*/ zulip@localhost
+/^mm.*/ zulip@localhost