[IPC] Mailers Allow Multiple Hosts

When an address resolves to a mailer that has [IPC] as its Path, the $@ part (host name) can be a colon-separated list of hosts instead of a single hostname. This asks sendmail to search the list for the first entry that is available exactly as though it were an MX record. The intent is to route internal traffic through internal networks without publishing an MX record to the net. MX expansion is still done on the individual items.

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