rsync ijackson@chiark:junk/yarrg-updates-archive-test .

rm -rf m.*
formail <yarrg-updates-archive-test -s sh -ec 'mkdir m.$FILENO; cd m.$FILENO; munpack -q /dev/stdin' >/dev/null 

grep -l '^ocean	Sage' m.*/metadata | xargs grep '^island	Admiral Island'