[Notifications] Use case--reply mail notification

Hi, all

Scenario: Bob is sending a email to Alice. Bob wants to get a instant notification via SMS something if Alice replies, since he is eager to know the reply of Alice. He is not interested in other emails. When Bob's mailbox in the email server recieves a new email, and find out it is a reply from Alice for that mail, a notification of SMS,like "You have got a reply mail from Alice", will be sent to Bob's cellphone.

Problem: For the email sending part, I prefer to realize this requirement by using a SMTP extension, e.g. define a new parameter for MAIL command, which includes the SMS URI or IM URI. (To Webmail, we need not to do any standard.)
For the notification part, pager mode message may be better; SUB/NOT event mechanism is not necessary. For example, SIP MESSAGE could be a good choice, if the users only want to get few notifications.

Market: It might be an attractive feature to enhance the existing email service.

Opinion?

Cheers,
Qian

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