Archive mail format?

[Les Mikesell <lesmikesell@xxxxxxxxx>]

I have a bunch of old mail spread variously across dovecot maildirs
and mbox format files on several machines that are headed for the
trash.  Is there anything considered to be a portable archive format
for mail messages, and if so are there tools to copy into it - or do I
have to pick a client and copy to its local storage?

-- 
   Les Mikesell
     lesmikesell@xxxxxxxxx
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