diff --git a/scripts/smtp-commands.nse b/scripts/smtp-commands.nse
index c72e73a06..f22372416 100644
--- a/scripts/smtp-commands.nse
+++ b/scripts/smtp-commands.nse
@@ -54,7 +54,7 @@ require "shortport"
 require "stdnse"
 require "comm"
 
-portrule = shortport.port_or_service({25, 587, 465}, "smtp")
+portrule = shortport.port_or_service({ 25, 465, 587 }, { "smtp", "smtps", "submission" })
 
 action = function(host, port)