I am trying to track an email. I use mutt so that I can edit the email headers directly before sending, and I added:
X-Confirm-Reading-To: me@email
Disposition-Notification-To: me@email
Return-Receipt-To: me@email
to the header of a test email to gmail.com. Alas, nothing happened although I at least expected a DSN.
Am I missing something, or are these just supported poorly?