Intelligent email bounce alarm

[r00dgirl]

Create a new bounces collection where each document has a 48hr TTL and has the following fields:

• formId: ObjectId
• hasAlarmed: boolean: whether an alarm has been sent
• bounces: Array<{ emailAddress: string, hasBounced: boolean }>: whether an email has bounced.

When we receive a bounce notification via webhook notifications, retrieve the document by finding the correct form ID. For each email in the list of bounced emails, set the corresponding hasBounced to true. If all the hasBounced are true and hasAlarmed is false, send an alarm write a log message and set hasAlarmed to true. CloudWatch should monitor the log message and trigger an alert if necessary

If the list of email recipients is different from the bounces array, update the bounces array.

If an email was successfully received, set hasBounced to false for the corresponding email.