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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SMTP Client Authentication
You may want your Postfix server to relay through other servers that require SMTP authentication. In addition to requiring passwords on your own server, you can configure Postfix to provide login names and passwords when relaying mail through other SMTP servers.
You have to provide Postfix with a password file that contains the
credentials it should use when authenticating to other servers. Entries
in the password file contain a domain or hostname, username, and
password in the form: domain
username:password. For the domain or hostname, Postfix
first checks for the destination domain from the recipient address. If
it doesn’t find the domain, it then checks for the hostname it is
connecting to. This allows Postfix to work easily with sites that have
multiple MX hosts that share the same user database. Use smtp_sasl_password_maps parameter to specify where your password file is.
The client smtp_sasl_security_options parameter works just like server smtpd_sasl_security_options (discussed earlier
in the chapter) for the SMTP servers. If you don’t specify any options,
the default allows all available mechanisms including plaintext but not
anonymous logins.
Procedure to Enable SMTP Client Authentication
Use the following steps to configure Postfix to provide a login and password when relaying mail. In this example, you’ll set up two different passwords for Postfix to authenticate when relaying through any server for the domain ora.com and through a host called ...
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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.