Darren Chamberlain asked,
| Isn't the idea of these to ascertain whether the recipient has
| *read* the message, not whether thay have *received* the message?
The Disposition-Notification-To: header is for notifying someone when a
message has been read, and only a mail user client can determine that; the
Return-Receipt-To: header is for notifying someone when a message has been
delivered, and only a local delivery agent (such as procmail) can do that.
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