diff --git a/dockers/postfix/Dockerfile b/dockers/postfix/Dockerfile
index afce43e..531b5aa 100644
--- a/dockers/postfix/Dockerfile
+++ b/dockers/postfix/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/mailserver/docker-mailserver:13.3.1
+FROM docker.io/mailserver/docker-mailserver:14.0.0
 
 ########################################
 # APT local cache
diff --git a/dockers/postfix/env-config b/dockers/postfix/env-config
index 7bf93c5..75f7dc2 100644
--- a/dockers/postfix/env-config
+++ b/dockers/postfix/env-config
@@ -210,7 +210,7 @@ SA_TAG2=6.31
 SA_KILL=6.31
 
 # add tag to subject if spam detected
-SA_SPAM_SUBJECT=***SPAM*****
+SPAM_SUBJECT=***SPAM*****
 
 # KAM is a 3rd party SpamAssassin ruleset, provided by the McGrail Foundation. If SpamAssassin is enabled, KAM can be used in addition to the default ruleset.