How to log out of my email on my iPhone if I don't have my phone with me? (it got stolen)?

I was in work and put my iPhone in my locker at work, now someone at the workplace went into my locker and took my iPhone, I all ready have the phone blocked but it's only blocked from ringing or messaging, people can still access the internet on it and most importantly my emails how can I avoid this or sign out of my email on it without having it?

Well i don't know if you sign out somewhere else it will work for other phones but all iphone have tracking devises on them and if they have not yet taken it apart then call the police or notify the phone company as soon as possible and cancel it or get a make on the location.

Log into your email account from your computer and change the password.