Memcache port MTA/channel options

Memcache MTA/channel options:  (port)
The  MTA/channel option specifies the port number for the server providing support for the memcache protocol. If not specified, it defaults to, the usual port for memcache servers.

Use of  is only supported in cases where a channel-specific memcache server makes sense semantically. Currently the only channels that support this usage are those associated with the MTA-STS server.

See also:
 * Memcache MTA options