Monitoring your Amazon SES sending activity – Amazon …

The email sending events that you can monitor are: Sends – The call to Amazon SES was successful and Amazon SES will attempt to deliver the email. Rejects – Amazon SES accepted the email, determined that it contained a virus, and rejected it. Amazon SES didn’t attempt to deliver the email to the recipient’s mail server. …

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/monitor-sending-activity.html