[READ] Step 1: Are you in the right place?

Yes, this issue is about a feature request for a specific extension in this repository.

[REQUIRED] Step 2: Extension name

This feature request is for extension: firestore-send-email

What feature would you like to see?

The extension currently allows passing basic mail fields (to, message, headers, etc.) into Nodemailer, but does not expose Nodemailer's DSN (Delivery Status Notification) option.

I would like to be able to include a dsn object in the Firestore document to request delivery status notifications via SMTP (RCPT TO NOTIFY=SUCCESS,FAILURE,DELAY). This would allow server-level delivery reports and is more reliable than non-standard headers like Return-Receipt-To.

Example Firestore document:

{
  "to": ["[email protected]"],
  "message": {
    "subject": "Test DSN",
    "text": "Hello with DSN"
  },
  "dsn": {
    "id": "12345",
    "return": "headers",
    "notify": ["success", "failure", "delay"],
    "recipient": "[email protected]"
  }
}