December 2003
Beginner
278 pages
10h 47m
English
Content preview from Postfix: The Definitive GuideBecome 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,
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MySQL
MySQL is an open source relational database system that uses Structured Query Language (SQL) for querying and managing its data. You don’t have to know SQL to use Postfix with MySQL, but it will help to understand how they interact. Normally, you would use MySQL because you already have a database of information about each user such as a full name, account name, phone numbers, etc. You have to make sure your database includes the information you need to accomplish a particular task with Postfix. A common use is to map an email alias to the local account name. For this to work there must be one database column containing email aliases and another with local account names. Postfix can query your database with the recipient address of an email message as the key to look up the value of the local account for delivery. Any of the Postfix lookup table parameters can work with MySQL queries. You just have to figure out which columns contain the information you need.
MySQL Configuration
MySQL maps are specified like any other map in Postfix. You specify the map type and the file containing the mappings. In the case of MySQL, however, the file you specify is not the lookup map itself, but rather a file that contains configuration information that specifies how to get the desired value from your database:
alias_maps = mysql:/etc/postfix/mysql-aliases.cf
The file mysql-aliases.cf contains configuration information that specifies how to get the information from MySQL. The parameters for ...
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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.