Normally I would but this unnecessary annoyance has been replaced by a bot. Few, if any, other sites require manual signing. Also you need to delete the whole entry, then give the reason to the poster so he can repost without the contact info. Otherwise he may not repost and the rest of us are then left in a quandary over his original post not providing an alternate method of contact. Also since the Wikipedia provides for email contact of all users if they add it to their preferences your job is to inform them of this instead of PLAYING GOD.