similar to: pigeonhole - how to whitelist

Thanks. That's exactly what I needed. However I have a permission problem. I added the parameter to 90-sieve.conf and created the directory but now I get the following permissions errors in maillog even though I have the file and directory wide open with 777 permissions: Error: yY/0JHtauVQfPgAAU+Cu/Q: sieve: failed to open sieve dir: stat(/var/lib/dovecot/sieve/after.d/) failed: Permission