You've heard of "buyer's regret," that moment of remorse you feel after spending a huge sum for an acquisition.

More than once, I have experienced "sender's regret," the feeling I get a split second after pressing the send button on a sharply worded e-mail message.

It doesn't matter how justified I might feel in responding angrily to a fellow executive who has offended me in some way. I have found myself wishing I could hit the recall button almost as soon ...