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Learning RHEL Networking

You're reading from   Learning RHEL Networking Gain Linux administration skills by learning new networking concepts in Red Hat Enterprise Linux 7

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781785287831
Length 216 pages
Edition 1st Edition
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Toc

Table of Contents (13) Chapters Close

Preface 1. Introducing Enterprise Linux 7 FREE CHAPTER 2. Configuring Network Settings 3. Configuring Key Network Services 4. Implementing iSCSI SANs 5. Implementing btrfs 6. File Sharing with NFS 7. Implementing Windows Shares with Samba 4 8. Integrating RHEL 7 into Microsoft Active Directory Domains 9. Deploying the Apache HTTPD Server 10. Securing the System with SELinux 11. Network Security with firewalld Index

Implementing e-mail delivery on RHEL 7

The default SMTP server used in the current release of RHEL is Postfix; the original Sendmail package is still available, but is no longer the default.

It's normal for the e-mail server to listen on the localhost or loopback address only when using default settings. In this way, local e-mail delivery is possible out of the box. This is used by many services, including the crond job schedule manager. If we wanted to enable Postfix to listen on all interfaces and receive messages from remote systems, there is a little configuration required.

Firstly, we will back up and tidy the main configuration file. There is a tendency for many software packages to over comment their configurations. This can cause issues where you think that you have implemented a change; however, it was also set later on and you may not have noticed it. There are 679 lines in the default configuration file: /etc/postfix/main.cf. We will back up the file so that we do not lose...

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