Red Hat Certified Engineer Tutorials
Configuring Email Services / Email Protocols and Agents
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Subtitles of the Movie (Red Hat Certified Engineer / Configuring Email Services / Email Protocols and Agents)
This video serves as a bit of an introduction on other videos on Email services. While Email on the client is straightforward and well known to most regular users, there are protocols and standards associated with Email that often cause much confusion, even among budding Linux administrators. So, let's review some basics. There are a number of standard protocols associated with Email. Three of them are: the Simple Mail Transfer Protocol, more commonly known as SMTP, the Post Office Protocol version 3, thusly known as POP3, and the Internet Message Access Protocol version 4, known as IMAP4. SMTP is associated with outgoing Email. POP3 and IMAP4 are associated with incoming Email. Red Hat Enterprise Linux 5 provides two package options for SMTP service: sendmail and Postfix. It also provides one standard option for incoming Email. The Dovecot service not only supports POP3 and IMAP4, it can also support their secure cousins, POP3S and IMAP4S. Yeah, there are many more protocols available associated with Email, but you're not expected to create connections on the RHCE Exam to other systems like Microsoft Exchange, which, by the way, is possible with the Evolution client. For Email administrators there are common references that you should be familiar with to Mail User Agents, Mail Transfer Agents, and Mail Delivery Agents. A Mail User Agent, or MUA, is an Email client, such as Evolution, Thunderbird, and Outlook. A Mail Transfer Agent, or MTA, is a service which transfers the Email to a server on the desired domain. Two examples of this are sendmail and Postfix. A Mail Delivery Agent is a service that actually takes the information from the local server and sends it to the client. Now, stop a moment and note: it's the MTA that transfers the Email over the network to the desired domain, so if you configure Postfix or sendmail, you may also need to configure access through your Firewall. Postfix or sendmail works with the SMTP protocol, and that's associated with port 25, easily configured with the Security Level Configuration tool, and that process should be well known to you by now. If you're accessing a Dovecot server remotely, you may also need Firewall access through associated ports for POP3 and IMAP4 services. They happen to be 110 and 143. If you have to configure access for the secure versions, look them up for yourself in the etc slash services configuration file. Finally, for good or for ill, there is no current fine grained protection available for mail services associated with SELinux.
Tutorial Information
| Course: | Red Hat Certified Engineer |
| Author: | Michael Jang |
| SKU: | 33845 |
| ISBN: | 1-934743-47-X |
| Release Date: | 2008-01-18 |
| Duration: | 6.5 hrs / 94 lessons |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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