Received version MTA option

Received header line MTA options:  (string)
RESTRICTED: Use of this option is not recommended.

The  MTA option sets the MTA version string to use when the MTA constructs Received: header lines. By default, if this option is not set, an internally constructed string is used that incorporates correct, current MTA version data.

Thus this option is the complement of the (also not recommended)  TCP/IP channel option.

See also:
 * Received header line MTA options
 * CUSTOM_VERSION_STRING