Daemon Channel Option

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Forced routing to gateways (daemon)

The interpretation and usage of the daemon option depends upon the type of channel to which it is applied. Currently, the only type of channel for which the daemon option is relevant is SMTP over TCP/IP channels. Normally such channels connect to whatever host is listed in the envelope address of the message being processed. The daemon option is used to tell the channel to instead connect to a specific remote system, generally a firewall or mailhub system, regardless of the envelope address. The actual remote system name is given as an argument to daemon.

If the argument after the daemon option is not a fully qualified domain name (or alternatively a square bracket enclosed literal IP address), the argument will be ignored and the channel will connect to the channel's official host. When specifying the firewall or gateway system name as the official host name, the argument given to the daemon option is typically specified as router.