MTA counters implementation

For performance reasons, each MTA host keeps a cache of MTA channel counters in memory using a shared memory section (on UNIX). As processes on the host enqueue and dequeue messages, they update the counters in this in-memory cache. If the in-memory section does not exist when a channel runs, the section will be created automatically. (The   command also creates the in-memory section, if it does not exist.)

The command   or the   command   may be used to show the values of the counters.

The command   or the    command   may be used to reset the counters to zero.

In addition to the above commands for directly displaying the MTA&#x27;s counters, on some platforms an SNMP subagent may be available to serve the MTA counters out through SNMP to any standards-based SNMP monitoring station.

See also:
 * counters -show utility
 * counters -clear utility
 * SNMP subagents
 * MTA counters