diff --git a/roles/base/files/postfix/main.cf/main.cf.smtp-mm b/roles/base/files/postfix/main.cf/main.cf.smtp-mm
index e72d39a40f..b740359b9e 100644
--- a/roles/base/files/postfix/main.cf/main.cf.smtp-mm
+++ b/roles/base/files/postfix/main.cf/main.cf.smtp-mm
@@ -559,7 +559,7 @@ recipient_delimiter = +
 #
 # For details, see "man header_checks".
 #
-#header_checks = regexp:/etc/postfix/header_checks
+header_checks = regexp:/etc/postfix/header_checks
 
 # FAST ETRN SERVICE
 #