UUCP_RELAY mc Macro
UUCP is usually modem-based and typically connects two individual machines together. Unlike domain-based delivery, UUCP delivery is from one machine to the next, and then from that next machine to yet another (using addresses such as fbi!wash!gw).
If your site handles UUCP traffic, that handling can be in one of two forms. Either a given host has direct UUCP connections or it does not. If it does not, you might wish to have all UUCP mail forwarded to a host that can handle UUCP. This is done by defining a UUCP_RELAY, which is defined just as you would define any other relay (as described in Relays on page 602).
If your machine or site does not support UUCP, we
recommend disabling all UUCP with the FEATURE(nouucp) (FEATURE(nouucp)
on page 636).
If your machine has directly connected UUCP hosts, you
might wish to use one or more of the UUCP
techniques. But before doing so, be sure to declare
the uucp delivery
agent (MAILER( ) m4 macro on page 590).
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