AXS:One archive integration

One approach for message archiving is to make use of an AXS:One archive. The MTA and the Message Store support integration with AXS:One for archiving.

See also:
 * Architecture of the AXS:One integration
 * MTA support for AXS:One archiving
 * MTA configuration for AXS:One archiving
 * Message Store archive options
 * Archiving messages