Duncan Hill followed up,
| In retrospect, I need to keep a spare copy of all mail
| that has been seen as a duplicate.
In that case, you need a different approach:
# regional lockfile is needed during condition (local lockfiles
# work only during actions of matched recipes)
LOCKFILE=msgid.cache$LOCKEXT
:0 W # with regional lockfile in effect, local not needed
* ? formail -D 32768 msgid.cache
duplicates
LOCKFILE # if not duplicate, remove regional lockfile
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