If the goal is to have grep-able messages easily,
two things come to mind:
1) my previous MIME-hooks scripts, which save the original
message as #.msg, and then use mhmimefix to massage the message
into something more human friendly. These can easily be extended.
Or, you could just add your own add-hook to convert message
character sets however you choose.
2) Use ack <http://beyondgrep.com>, and add some filters for
RFC5322 files if there isn't one already.
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