You can if it's me, since I sign my reviews and include an email address. No one ever has, though. - Bill Hooker

actually, very recently I decided to sign my referee report for the fist time and when I saw the comments from all the reviewers together the editor (or staff) edited out my name and one specific sentence where I said something like "my previous work [Ref]". It was even weirder since I have received once a signed referee report in this same journal.. - Pedro Beltrao