@greyfish7: Exchange servers also has this feature, but it only works for people in the same system and server as you are, because the e-mail server is just like a post office, once the message is delivered to the other servers, the sender cannot retrieve the "package" since it does not have any control of the other…

@Advertising Guru: Sometimes it's just not about angry e-mail, maybe you just got some knew info or want to correct a previous statement.

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