This is not mentioned in the courierfilter documentation.
Mail recipients that did not whitelist the sender, via the maildrop API, will have their mail filtered against everything in /var/spool/courier/filters and /var/spool/courier/allfilters. Mail to recipients that whitelisted the sender, or mail to destinations that do not use a maildrop API-compatible filter, will be filtered only against the contents of /var/spool/courier/allfilters.
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SEE ALSO
localmailfilter(7),
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