Notification for snapshot creation at email everyday

In my environment I receive emails with the same event pattern as yours.
If the ARN of the specified EBS is different, the rule will not be executed.
Check "Invocations" and "TriggeredRules" in CloudWatch metrics.
If there are no metrics, the rule may not have been executed.
If the rule is running, check all your email inboxes.

For reference, this is the event pattern used in my environment.
Volume ID is masked.

{
  "source": ["aws.ec2"],
  "detail-type": ["EBS Snapshot Notification"],
  "detail": {
    "event": ["createSnapshot"],
    "source": ["arn:aws:ec2::ap-northeast-1:volume/vol-xxxxxxxxxxx"]
  }
}