There's a Zimlet called "Undo Send" that does something like what you're asking, but I don't know if it can hold the message for several minutes. I haven't used it, and from what I saw in the preferences pane, the delay is for "seconds".
UPDATE: I've just checked. It doesn't go into the "minutes" range, it delays delivery for up to 20 seconds.
Last edited by odeleon; 07-23-2010 at 05:03 AM..
Reason: Checked the Zimlet and posted info about it
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