MAIL_HUB mc Macro
One scheme for handling mail is to maintain one mail spool directory centrally and to mount that directory remotely on all clients. To avoid file-locking problems, delivery to such a spool should be performed only on the central server. The MAIL_HUB mc macro allows you to specify that all local mail be forwarded to the central server for delivery. The point is to let unqualified names be forwarded through a machine with a large aliases file.
If you define both LOCAL_RELAY and MAIL_HUB,
unqualified names and names in the class $=L are sent to
LOCAL_RELAY and other local names are sent to
MAIL_HUB. To illustrate, consider the result of
various combinations for the user
you on the machine
here.our.site.
If LOCAL_RELAY is defined as relay.our.site and MAIL_HUB is not defined, mail addressed to you is forwarded to relay.our.site, but mail addressed to you@here.our.site is delivered locally.
If MAIL_HUB is defined as hub.our.site and LOCAL_RELAY is not defined, mail addressed to you and mail addressed to you@here.our.site is forwarded to hub.our.site for delivery.
If both LOCAL_RELAY and MAIL_HUB are defined as shown earlier, mail addressed to you is sent to relay.our.site for delivery, and mail addressed to you@here.our.site is forwarded to hub.our.site.
If you want all outgoing mail to go to a central machine, use SMART_HOST too.
Note that LOCAL_RELAY is considered most useful when
combined with the FEATURE(stickyhost) (FEATURE(stickyhost) on page 642). Also note that the ...
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