$R
The relay for unqualified names mc configuration, deprecated
Using the mc configuration
technique, the $R
macro stores the hostname defined by LOCAL_RELAY
(LOCAL_RELAY mc Macro
on page 604). If $H has a value and if $R does not, all local
email is forwarded to the hub
defined for $H.
If $R is defined,
it takes precedence over $H for some mail. See MAIL_HUB mc Macro on page
605 for a description of MAIL_HUB and how it
interacts with LOCAL_RELAY.
Note that you should not define this $R macro directly,
because later versions of
sendmail might use a
different macro. Instead, use the LOCAL_RELAY
mc macro for this
purpose.
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