An interesting article in The Telegraph provides another example of how a proactive approach to inappropriate content in the workplace is always better than the consequences of being reactive.
If Image Analyzer had been deployed as a part of the email security system in this case a warning would have appeared when this email was being sent, advising that it breached policy, and may have ensured the person did not use the company email system to send it.
Regardless of the question of unfair dismissal, being instantly aware the behaviour breached policy would have protected the person involved and also the brand of Leeds United from adverse publicity