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Chapter 16. Email 219

Authority (CA) for an SSL certiﬁcate, or you can create a self-signed certiﬁcate to provide the beneﬁt

of the SSL encrypted communication.

To create a self-signed SSL certiﬁcate, change to the /usr/share/ssl/certs/ directory, type the

make stunnel.pem command, and answer the questions. Then, use stunnel to start the mail dae-

mon that you wish to use.

For example, the following command could be used to start the IMAP server included with Red Hat

Linux:

/usr/sbin/stunnel -d 993 -l /usr/sbin/imapd imapd

You should now be able to open an IMAP email client and connect to your email server using SSL

encryption. Of course, you will probably want to go a step further and conﬁgure your stunnel-

wrapped IMAP server to automatically start up at the correct runlevels.

For more information about how to use stunnel, read the stunnel man page or refer to the docu-

ments in the /usr/share/doc/stunnel-

version-number directory.

Alternatively, the imap package bundled with Red Hat Linux contains the ability to provide SSL

encryption on its own without stunnel. For secure IMAP connections, create the SSL certiﬁcate by

changing to the /usr/share/ssl/certs/ directory and running the make imapd.pem command.

Then, set the imapd service to start at the proper runlevels.

You can also use the ipop3 package bundled with Red Hat Linux to provide SSL encryption on its

own without stunnel.

16.7. Additional Resources

Many users initially ﬁnd email programs difﬁcult to conﬁgure, primarily due to the large number of

options available. Below is a list of additional documentation to help you properly conﬁgure your mail

applications.

16.7.1. Installed Documentation

• Information about how to conﬁgure Sendmail is included with the sendmail and sendmail-cf

packages.

• /usr/share/doc/sendmail/README.cf — Contains information on m4, ﬁle locations for

Sendmail, supported mailers, how to access enhanced features, and more.

• /usr/share/doc/sendmail/README — Contains information on the Sendmail directory

structure, IDENT protocol support, details on directory permissions, and the common problems

these permissions can cause if misconﬁgured.

In addition, the sendmail and aliases man pages contain helpful information covering various

Sendmail options and the proper conﬁguration of the Sendmail /etc/mail/aliases ﬁle, respec-

tively.

• /usr/share/doc/fetchmail- version-number — Contains a full list of Fetchmail fea-

tures in the FEATURES ﬁle and an introductory FAQ document.

• /usr/share/doc/procmail-

version-number — Contains a README ﬁle that provides an

overview of Procmail, a FEATURES ﬁle that explores every program feature, and an FAQ ﬁle with

answers to many common conﬁguration questions.

When learning how Procmail works and creating new recipes, the following Procmail man pages

are invaluable:

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