Pro tip: If you're using GMail, install the Undo Send plugin, going strong since 2009. http://gmailblog.blogspot.com/2009/03/new-in-labs-undo-send.html http://

Pro tip: If you're using GMail, install the Undo Send plugin, going strong since 2009. http://gmailblog.blogspot.com/2009/03/new-in-labs-undo-send.html http://gmailblog.blogspot.com/2009/03/new-in-labs-undo-send.... (I realise in this case it was the receiver, not the sender, using GMail, but I'm sure a lot of people here send from GMail.)