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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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