The Sendmail Module

The Sendmail module in Webmin is thoroughly comprehensive, and it provides one-to-one access to nearly all, if not all, of Sendmail's important options and features. Opening the main Sendmail module page provides you with a number of icons that represent each type of option in the Sendmail configuration files (Figure 11-1). From here, you can edit the various global options, edit aliases, configure user mail settings, restrict access to your mail server, and even control the mail queue and read mail.

Figure 11-1: Sendmail module

Sendmail is configured in a number of files. The first, and most intimidating,is the sendmail.cf file. This configures all of the various limits and behaviors of Sendmail. The rest are related to users, hosts, domains, and aliases. They dictate primarily to whom mail is sent, and who and what hosts or networks have permission to send and receive mail from the server. The sendmail.cf file is configured on the Options page, discussed in the next section, while each of the other option files have their own page which are discussed in the Other Files section.