Received header line MTA options

The MTA has a number of options related to Received: header lines and message-ids, and relating to the MTA&#x27;s facility to sideline as  files those messages that appear to be looping.

See also:
 * held_sndopr MTA Option
 * id_domain MTA Option
 * max_local_received_lines MTA Option
 * max_mr_received_lines MTA Option
 * max_received_lines MTA Option
 * max_total_received_lines MTA Option
 * max_x400_received_lines MTA Option
 * received_domain MTA Option
 * received_version MTA Option
 * MTA options