diff --git a/ses-domain/main.tf b/ses-domain/main.tf
index a11377f..9a05e1a 100644
--- a/ses-domain/main.tf
+++ b/ses-domain/main.tf
@@ -266,7 +266,7 @@ resource "aws_sns_topic_policy" "ses_event" {
 resource "aws_ses_identity_notification_topic" "ses_event" {
   for_each                 = toset(local.ses_event_types)
   topic_arn                = aws_sns_topic.ses_event[0].arn
-  notification_type        = each.key
+  notification_type        = title(each.key)
   identity                 = aws_ses_domain_identity.this.domain
   include_original_headers = true
 }