Book Image

Linux Email

Book Image

Linux Email

Overview of this book

Many businesses want to run their email servers on Linux for greater control and flexibility of corporate communications, but getting started can be complicated. The attractiveness of a free-to-use and robust email service running on Linux can be undermined by the apparent technical challenges involved. Some of the complexity arises from the fact that an email server consists of several components that must be installed and configured separately, then integrated together. This book gives you just what you need to know to set up and maintain an email server. Unlike other approaches that deal with one component at a time, this book delivers a step-by-step approach across all the server components, leaving you with a complete working email server for your small business network. Starting with a discussion on why you should even consider hosting your own email server, the book covers setting up the mail server. We then move on to look at providing web access, so that users can access their email out of the office. After this we look at the features you'll want to add to improve email productivity: virus protection, spam detection, and automatic email processing. Finally we look at an essential maintenance task: backups. Written by professional Linux administrators, the book is aimed at technically confident users and new and part-time system administrators. The emphasis is on simple, practical and reliable guidance. Based entirely on free, Open Source software, this book will show you how to set up and manage your email server easily.
Table of Contents (15 chapters)
Linux E-mail
Credits
About the Authors
About the Reviewers
Preface

Summary


In this chapter, we discussed how to secure your installation. There were several different topics covered, firstly, the configuration of Postfix to only accept e-mail from certain IP addresses, which is useful if all your users are office based. Next, the chapter covered using SASL to authenticate users who might connect from any IP address. Then, we looked at using TLS to encrypt the authentication between client and server. Finally, we looked at limiting clients which behave badly, using the anvil daemon to limit clients that connect too often within a certain time period, and clients that open too many connections at one time.

The measures shown in this chapter will make your life as a postmaster easier, and also help to limit the amount of spam that your users endure, and if you had inadvertently configured an open relay, limit the amount of spam passed on to other Internet users too. For more details on limiting spam, move on to Chapter 8 that describes using the open source...