It can be enabled with one setting.
The reason we removed it was due to people constantly abusing the 'regulations' on having a signature.
Can you imagine trying to browse a topic when you have to wait for 50 massive gifs and people who seem its necessary to have 10 images in a signature.
Just a quick one,
Email verification and the site's search engine is now back online.
If you are using a service provided by microsoft, it will take a while for them to update their records, as at the moment they are blocked.