Twice when I awaken my I-Mac, OSX 10.7, I hear the sound of mail sending, one right after another. Both times this happened the MAIL program was open. The first time the sound continued for some time, and I do not recall what I did to stop it. Yesterday it happened again and stopped by itself after about 10 send sounds, in quick succession. I checked both the MAIL and the THUNDERBIRD mail programs and neither showed anything sent. This has only happened twice, and at the moment the computer wakes up it is happening, never when I am working on the computer, except, of course, when I am actually sending a message.