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lastresort)
The lastresort keyword is used to specify a host to which
to connect when all other connection attempts fail. In effect this acts
as an MX record of last resort. This is only useful on SMTP channels.
The keyword requires a single parameter specifying the name of the "system of last resort", e.g.,
tcp_local single_sys smtp mx lastresort mailhub.example.com TCP-DAEMON |
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