You can create an email subscription as follows:
aws sns subscribe
--topic-arn arn:aws:sns:us-east-1:<account id>:my-first-sns-topic
--protocol email
--notification-endpoint [email protected]
--profile admin
With email, the subscription ARN will not be confirmed until the user validates the subscription:
You will now get an email for confirmation of the specified email address:
Once you click on Confirm subscription, you will be taken to a confirmation page: