October 2007
Intermediate to advanced
1308 pages
161h 13m
English
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FEATURE(relay_based_on_MX)
Relay based on MX records V8.9 and later
Ordinarily, the decision to relay is not based on MX records. Relaying based on MX records poses a risk that outsiders might use your server as a relay for their site (that is, they might set up an MX record pointing to your mail server, and you will relay mail addressed to them without any prior arrangement).
This FEATURE(relay_based_on_MX) reverses
that policy. This feature, how it is used, and how
it fits into relaying and spam handling are
explained in FEATURE(relay_based_on_MX) on page 271.
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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.