The URI you submitted has disallowed characters?

[eluser]Dam1an[/eluser]
In which case, a little background reading is in order

Whats happening is, at the moment, CI is looking for a function with the name of the email address in the verify controller (passing the key as a paramter)

What you want to do, is map it to a controller (such as account) to the verify fuction, passing the email and key as the 2 parameters