Find out whose wireless network it is and give them a courtesy call. Bring donuts.

OK well solution almost fixed we simply had the wireless locked down and made our firewall ruling more strict!

But is there anyway to stop them accessing email through an email client such as mail?

I don't seem to be able to block that kind of access as email all runs on the same protocol (ports).

i.e they may access hotmail through a mail client such as mail, thunderbird, entourage etc etc...

Thanks

You can block individual hosts/sites through DNS. See the local guru if you are running your own server, or just use the /etc/hosts file:

12.34.56.78 hotmail.com www.hotmail.com

hotmail will go wherever you want it to go ;)

The double listing is there 'cause it's a little narrow-minded about what matches.