Transform part of a message body

I get some emails sometimes that have a long line of characters, usually used to mark a huge set of footers

Something like

============================
Text goes here

(or maybe -’s *’s or other characters.

I’d like to modify a message with, say, a line of 10 or more repeated characters and change that line to be a signature delimiter.

If this would be better done at the MTA (postfix) then that’s fine. I do need to only modify plain text messages, however.

-- 
I think I found your marbles.


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