Providing E-mail reliability with addendum #1

We need mail client software support for the following. Make it automatically prepend a few identifier characters and a (decimal) sequence number to the subject line of outbound messages.

The sequence number would get incremented, and could perhaps wrap around. In case of replying to a similarly formatted message, the mailer could also send back the highest number up until all mail have been successfully received from the given sender. The MUA could automatically resend the lost messages. These measures would ensure reliability - just like how they do it in TCP! I know you could easily implement this in Emacs, but I would like to see this in some more mainstream mail user agents.

Add 1: Of course we could also create a new header field for this purpose. Also note that this method could replace message disposition notification in almost all cases.

RFC?

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