Not her fault

A husband went on a business trip to San Jose and was expected to return after two weeks. Realizing this, the guy's wife called over her boy friend for some action. The husband returned pretty early from the trip because of some cancelled meetings and was utterly surprised to see his wife in bed with someone else. He couldn't take this and started yelling at his wife. Hearing the loud yells, the girl's mom came upto the husband and asked him, "What happened?". The guy explained whatever happened and the mother-in-law tried to console him, "Something must have gone wrong. My daughter is a girl with a very good upbringing and she would not do this". Hearing this the guy said, "I sent her an email that I am coming back tonight". The wife immediately replies, "Sorry, but I didnot get your email". The mother in law adds, "See! didn't I tell you that something was wrong".