October 2007
Intermediate to advanced
1308 pages
161h 13m
English
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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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.