Red Hat Certified Engineer Tutorials
Configuring Email Services / Basic sendmail Configuration Pt.1
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Subtitles of the Movie (Red Hat Certified Engineer / Configuring Email Services / Basic sendmail Configuration Pt.1)
There are two basic versions of sendmail available. An Open Source version, and a commercial version. Of course, it's the Open Source version that's included with Red Hat Enterprise Linux 5. The real sendmail configuration file is sendmail dot cf. It's nearly 2,000 lines long and the language is beyond the capabilities of even many Linux gurus. For that reason, there's also a simpler sendmail dot mc Macro file available. It's about 200 lines long and a set up sendmail for basic operation, you just have to pay attention to a very few of those lines. Let's open up the default version of this file. Like other sendmail configuration files, it's available in the etc slash mail directory, sendmail dot mc. The first thing you might notice about this file is all these dnls. What does that mean? A dnl? When, at the front of a line, works like a comment character, in other words, it tells sendmail don't process this line. There are also dnls at the end of lines. What that tells sendmail is don't process anything in the directive after that point. Now, let's analyze a few key lines in this file. If you want to forward Email to a different sendmail or other SMTP server, you'll want to activate this directive. You would delete the dnl in front of the directive, and then substitute the url or IP address of the sendmail or other SMTP server to which you're forwarding. Next, there's the one thing that you actually need to do with this file. The default version of the sendmail dot mc Macro includes this daemon options line. It limits access to the local system, and that's no good if you're setting up sendmail for a local network. So, I'm going to comment out this line by adding a dnl in front. There is a similar line a few lines down. This particular directive, if it were active, would limit access on an IPv6 network to the local host address. If you happen to be configuring this sendmail server for both IPv4 and IPv6 networking, which is possible on the Red Hat Exams, you'd want to activate this directive by x-ing out the dnl. Now, let's save the changes to this file and look at a few other sendmail configuration files. First there are etc aliases. This file includes forwarding addresses, in other words, Email to accounts such as shut down and halt are forwarded to the root account. If this line were active, Email to the root account would be forwarded to Marc's local account. But I'm not Marc. My account name is Michael. So, I make this change and I process it with the new alias command.
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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