SpamfilterN null action MTA options

Spamfilter MTA options:    (URL)
The    MTA options specify, respectively, the Sieve action to take when a "null" verdict is returned by the Nth spam/virus filter package. The default value for these options is: data:,discard; meaning that a null verdict is interpreted as a request to discard the message.

See also:
 * Sieve filters
 * Spamfilter MTA options