To answer your unnumbered opening question, email headers start with the five characters "From" (note the trailing space and no colon, which distinguish it from the "From:" header) and end when a blank line is encountered. The various "---Part"-type separators, if present, occur within the body of the email message after a blank line has indicated end-of-headers, so you don't need to rely on (or try to parse) them.

In reply to Re: Parsing email for headers by dsheroh
in thread Parsing email for headers by PoorLuzer

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