External filtering context MTA options

The  MTA options set context for filtering performed by external-to-the-MTA components, such as when    makes use of Sieve rules or spam/virus filter packages  to perform message expiration.

For MTA options relating to the MTA&#x27;s own Sieve filter use or Spam/virus filter package integration,  see respectively the  Sieve filter MTA options and Spamfilter MTA options.

See also:
 * scan_channel MTA Option
 * scan_originator MTA Option
 * scan_recipient MTA Option
 * expiresieve Store Option
 * imexpire invoking spamfilter packages
 * Spam and virus filtering
 * Sieve filter MTA options
 * Spamfilter MTA options
 * MTA options