def canonical
      c = self.local.canonical
      c += "@" + self.host.canonical if self.host.canonical && self.host.canonical > " "
      c
    end
def canonical
      c = self.local.canonical
      c += "@" + self.host.canonical if self.host.canonical && self.host.canonical > " "
      c
    end
Returns the canonical email address according to the provider
 uniqueness rules. Usually, this downcases the address, removes
 spaves and comments and tags, and any extraneous part of the address
 not considered a unique account by the provider.