A joke on spam filtering

I heard a funny story on spam filtering.

A corporation tried to deploy content filtering solution to reduce spam emails. One of the targetted keywords is "sex" since a large number of pornography spam emails contain the word "sex" in the message body. However, a nightmare occurred. All emails sent in for job applications were inadvertently filtered because in the CV part, the applicants need to tell their sex is male or female.

Good luck to those that rely on content filtering to fight spam !!