diff --git a/src/main/resources/marking.properties b/src/main/resources/marking.properties
index bb11537..c9733b5 100644
--- a/src/main/resources/marking.properties
+++ b/src/main/resources/marking.properties
@@ -27,11 +27,7 @@
 enable.email=true
 
 # email delay in seconds (rate limiting)
-email.delay=2
-
-# submission key is id or username?
-submission.key.type=id
-#submission.key.type=username
+email.delay=4
 
 # show maximum on report
 report.showmax=true