Amazon SES
Email with Amazon SES
Confirmation, incident and maintenance emails go out through Amazon SES.
Each email is a job in a queue with retries, so a slow or failing send never holds up posting an update. Every subscriber email carries List-Unsubscribe headers for one-click unsubscribe.
SES reports bounces and complaints through signed notifications. uptimeloom verifies each signature, then suppresses that address so it is not emailed again.