Some clues about signatures:
(1) Sigs are preceded by the "sigdashes" line, ie "\n-- \n".
(2) Sigs contain at least the name and address of the sender.
(3) Sigs are at most four lines and at most eighty characters per line.
ig block: /sig blok/ [UNIX; often written `.sig' there] n.
Short for `signature', used specifically to refer to the
electronic signature block that most UNIX mail- and news-posting
software will {automagically} append to outgoing mail and news....