MM> What adds your signature?  I know some modern email programs add 3 dashes
 MM> before a signature, but I don't know of any BBS/offline readers that do
 MM> that.

Mystic has it as an option in the users personal setting to auto add a sig to the end of your messages. I add the --- at the end of my message porson myself just because that's the way I was taught to show the end of my messages online.
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Legends of Yesteryear (FIDO 1:123/256) - telnet: furmenservices.net:23322

--- Mystic BBS v1.12 A47 2021/09/29 (Windows/64)