What would be the "Essential Headers"

Hi

I have a few years worth of messages of a now defunct mailing list which I
would like to archive (that means quite a few messages). I would like to
trim the headers with formail and was looking for a good list of
"essential" or "important" headers that I should not touch. I know the
obvious one, I think (To, From, Message-ID, etc.) but could use some
guidance just in case.

I actually stumbled onto a web page with a nice procmail recipe to do it
some months back, but cannot find it anymore. If anyone knows of it that
would be great too.

Thanks a lot.

Antonio


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