December 2002
Intermediate to advanced
1232 pages
56h 38m
English
Content preview from Sendmail, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
Name
FEATURE(masquerade_entire_domain)
Synopsis
Ordinarily,
masquerading transforms any host from a list of hosts in the class
$=w ($=w) into the host
defined by MASQUERADE_AS. If domains are also masqueraded with
MASQUERADE_DOMAIN, they too are transformed. For example, consider
these declarations:
MASQUERADE_AS(`our.domain') MASQUERADE_DOMAIN(`her.domain')
The first line causes any host part of an address contained in the
class $=w to be transformed into
our.domain. The second line transforms the
domain part of her.domain into
our.domain.
The key point here is that the domain part her.domain will be transformed, whereas hosts under that domain will not be transformed:
george@her.domain → becomes → george@our.domain george@host.her.domain → remains → george@host.her.domain
If you wish MASQUERADE_DOMAIN to transform all the hosts under the
declared domain, you can use the
masquerade_entire_domain feature:
MASQUERADE_AS(`our.domain') MASQUERADE_DOMAIN(`her.domain') FEATURE(`masquerade_entire_domain')
This feature extends masquerading of her.domain to include all the hosts under that domain:
george@her.domain → becomes → george@our.domain george@host.her.domain → becomes → george@our.domain george@host.sub.her.domain → becomes → george@our.domain
Note that you can masquerade only domains that are under
your direct jurisdiction and control. Also note that
domain masquerading is intended for actual domains. Virtual domains
are better handled with the genericstable feature
(FEATURE(genericstable) ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.