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Figure 29-19: Creating a virtual user You will see a drop-down box that shows the current virtual domains configured on the system and also a filter as you saw in the user list. Select the domain you wish to create a virtual user for and also the real system user you want that mail to go to. When you are happy with your configuration, click Create to save your configuration. Now, all mail for info@wiley.com will be received by the user justin.

The default SLOX installation provides you with a working mail server infrastructure for your organization, but if you want to tweak your settings, this can all be done through the web interface. Postfix allows your users to authenticate to the mail server when they are not on the trusted network. (See 17 for information on trusting users.) This means that if some of your users are on a dial-up connection, they can send mail through the mail server for people who are not in your domain. To do this, select the Mail Server section and click the Postfix subsection. You will see a screen like that displayed in Figure 29-20.

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To enable SMTP authentication, change the drop-down box for authentication via SMTPAUTH to On and click the Confirm button. You users will now be able to configure their mail client to send authentication information to the SMTP server before they attempt to send any mail.

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purposes; it is the de facto form of communication in a network environment [171, 6, 149, 58, 63L Why should e-mail be so complex Part of the trouble is that, in the past, there were many different kinds of network and many different ways of connecting up to different hosts. This made it quite a complex issue to relay messages all over the world. Today things are much simpler: most sites use the Internet protocols and some of the technical aspects of mail configuration can be simplified. Some operating systems like GNU/Linux provide a program which automatically helps set up e-mail for simple host configurations, but these are no substitute for a carefully considered e-mail system. In this chapter we shall consider only the popular mail transfer agent sendmail. Sendmail changes so often that anything specific written about it is likely to be out of date by the time you read this, so this section will necessarily be of a schematic nature. The source code and documentation for sendmail are available from ref. [233]. No matter whether the majority of local users read mail on a PC or on a Unix workstation, every site requires a mail transfer agent like sendmail in order to handle incoming and outgoing transfers. Because of the way Unix-like operating systems multitask, and because their behaviour is well known in a network context, it is highly recommended that e-mail traffic be handled by a Unix-like operating system. 8.7.1 Models of Mail Delivery

The mail server will not ask the client for authentication details for the user. It is up to the client to tell the mail server it wants to authenticate itself before sending mail. With this in mind, a mail client must support the SMTP-AUTH standard to be able to authenticate to an SMTP server.

As with most things in the world, there are people who want to spoil email for the rest of us. Spammers are out there, sending useless mail by the thousands, and most people s mailboxes are full of this spam. SLOX includes the excellent SpamAssassin prevention mechanism to check each email that is received by the mail server based on things such as keywords, the format of the mail (HTML as opposed to plain text), inclusion of images, and so on. If the mail is deemed spam, it is sent to the user s spam folder so the user can see it and decide whether to keep it or not. (This helps to stop any false positives losing user s mail.) To enable spam prevention, change the SPAM Filter drop-down box to On and click Confirm to save the changes.

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