NA> Renegade uses a proprietary format for storing messages and uses a
 NA> utility to  manipulate the scanning/tossing of mail in *.MSG format. I
 NA> do not believe  Mystic supports *.MSG.

Correct, Mystic doesn't toss in MSG format so if that is all ReneMail can handle then it probably wouldn't work without some extra layer of software.

FidoNet uses PKT bundles and that is what Mystic tosses.

Mystic does do directory tossing though, so it can be a hub for any number of other BBS software without requiring a mailer to run for any of them, but those softwares still need to be able to support FidoNet (ie PKT files) which Renegade doesn't.

... Kilometers are shorter than miles. Save gas, take your trip in kilometers

--- Mystic BBS v1.12 A47 2021/10/25 (Windows/64)