Processing priority MTA options

A few general MTA options affect message processing priority.

See also the  and   MTA option which control, respectively, whether MTPRIORITY and  effective processing priority are included in MTA message transaction log file entries. See also the  MTA option which controls whether Precedence: header lines affect  generation of delivery delay  notifications. See also the   MTA option which influences whether group expansion is performed "in-line" or "off-line" (by the Reprocess channel).

For additional influences on processing priority, see also the  channel option, and Job Controller priority-based processing, and the  Sieve   and   extensions.

See also:
 * defer_group_processing MTA Option
 * log_mtpriority MTA Option
 * log_priority MTA Option
 * mtpriority_policy MTA Option
 * non_urgent_block_limit MTA Option
 * normal_block_limit MTA Option
 * urgent_block_limit MTA Option
 * use_precedence MTA Option
 * Notification message types
 * Job Controller priority-based processing
 * Sieve setpriority and setmtpriority extensions