SNS (Simple Notification Service)
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What is it?
A "pub/sub" (publish/subscribe) service for notifications, basically acting as a place to store application-related notifications.
Why did we choose it?
It's a necessary part of good practice when using AWS SES (the email service).
What do we use it for?
Monitoring undeliverable emails. A notification is sent when an email bounces, allowing us to check when we should not be sending emails to a particular destination.