"You got mail" joke

A man was in his front yard mowing grass when his attractive
blonde female neighbor came out of the house and went straight to
the mail box.
She opened it, then slammed it shut, and stormed back in the
house. A little later she came out of her house and again went to
the mail box and again opened it, then slammed it shut again.
Angrily, back into the house she went.
As the man was getting ready to edge the lawn, here she came out
again, marched to the mail box, opened it and then slammed it
closed harder than ever. Puzzled by her actions the man asked
her, "Is something wrong?"
To which she replied, "There certainly is! My stupid computer
keeps giving me a message saying, "YOU'VE GOT MAIL!"