spiralofhope

• mh is, I believe, the MH Message Handling System

• Maildir

http://offog.org/git/misccode/mh-to-maildir

#!/bin/sh
# Convert an mh folder into a maildir.
# Adam Sampson <ats@offog.org>
# The "maildir" command is part of safecat:
if [ $# != 2 ] ; then
  echo "Usage: mh-to-maildir mhdir maildir"
  exit 1
fi
mhdir="$1"
maildir="$2"
mkdir -p "$maildir/new" "$maildir/cur" "$maildir/tmp" || exit 1
ls "$mhdir" | egrep '^[0-9]+$' | sort -n | while read n ; do
  maildir "$maildir" <"$mhdir/$n" || exit 1
done

Usage

./mh-to-maildir ~/Mail ~/Maildir-test

I had various accounts in Claws Mail, so I did stuff like this:

./mh-to-maildir ~/Mail/subfolder1 ~/Maildir-test