Multiple gateways on a single channel (multigate, nomultigate)

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Multiple gateways on a single channel (multigate, nomultigate)

The multigate channel option tells the MTA to route the message to the daemon mailbox specified by the daemon channel option on the system specified in the message's To: address. This differs from the MTA's normal behavior when the multigate channel option is not used, in which case the MTA routes the message to the official host associated with the channel, not the system specified in the message's To: address.

There are a variety of caveats associated with using the multigate channel option; some of its former uses are now obsolete. The remaining usage is on LMTP channels. nomultigate is the default.