DISABLE CIRCUIT

TCP/IP-channel-specific options: DISABLE_CIRCUIT (0 or 1)
The MTA&#x27;s SMTP server implements a private command XCIR. This command returns MTA circuit check information. Releasing such information may consistute a breach of security for some sites. Setting the SMTP server option   to 1 disables the XCIR command, so that the SMTP  server responds with the error 550 5.7.0 XCIR command has been disabled. to any XCIR command attempts. Setting   to 0 enables the  XCIR command. If  is not explicitly set, then use of  the XCIR command is controlled by the    TCP/IP-channel-specific option setting. In 8.0, the default has changed to 1, disabling the XCIR command.

SMTP server probes of the PORT_ACCESS mapping table can enable use of XCIR  (overriding a more general    or     setting) for connections from particular source IPs (e.g., the  host itself, 127.0.0.1, and particular administrator systems) via the  (new in Messaging Server 7.0)    flag.

See also:
 * DISABLE_GENERAL
 * PORT_ACCESS mapping table
 * TCPIP-channel-specific options