disable it in send and receive settings - ctrl+alt+s to bring up the dialog.
if you are connected to the net and just want a delay incase you change your
mind, you can use a rule to delay messages up to 120 minutes.
http://www.outlook-tips.net/archives/2007/20070508.htm

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> Hello--I'm having trouble canceling the automatic send receive when a new
> message is sent to the outbox--in other words, I'd like composed messages
[quoted text clipped - 4 lines]
> it
> out in 2007. Any help is appreciated.