Email and DNS

The Domain Name System (DNS) is a vast distributed database whose main job is to map hostnames to IP addresses. It also has an important role in email routing. In this chapter we'll look at how MTAs in general use DNS and some of the DNS issues that relate to Postfix and its configuration. Keep in mind that there are two important aspects to your mail servers and DNS:

  • For sending mail, the system running your Postfix mail server must have access to a reliable DNS server to resolve hostnames and email-routing information.
  • For receiving mail, your domains must be configured correctly to route messages to your mail server.

Misconfiguration of DNS servers is a common source of problems in setting up email servers.

Introduction

Prerequisites

Postfix Architecture

General Configuration and Administration

Queue Management

Email and DNS

Local Delivery and POP/IMAP

Hosting Multiple Domains

Mail Relaying

Mailing Lists

Blocking Unsolicited Bulk Email

SASL Authentication

Transport Layer Security

Content Filtering

External Databases

Appendix A. Configuration Parameters

Appendix B. Postfix Commands

Appendix C. Compiling and Installing Postfix

Appendix D. Frequently Asked Questions

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Postfix(c) The Definitive Guide
Postfix: The Definitive Guide
ISBN: 0596002122
EAN: 2147483647
Year: 2006
Pages: 130
Authors: Kyle Dent D.
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