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762 Part V . SUSE Linux in the Enterprise Tip It is always a good idea to make sure users are aware they are over their quota limits, but still allow their mail to be delivered; otherwise, they may lose important correspondence. If you want to allow this functionality, set Mail will be rejected immediately when quota limit is exceeded to No. Managing Groups and Folders If you want to organize your users into groups or want to create shared mail folders for certain users, you can do this through the web interface. Creating a Group of Users Select the Groups/Folders section, and then the Create Groups subsection (see Figure 30-22). Figure 30-22: Creating a new group Again, you will be presented with the now familiar filter for all of your users. To create a group, enter the group name and a description for the group. Using the filter, select the users you want to be contained in the group and click the Confirm button.
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Chapter 30 . SUSE Linux OpenExchange Server 761 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. Managing the Cyrus Subsystem To set Cyrus-specific configuration options, select the Mail Server section and the IMAP Configuration subsection (see Figure 30-21). Figure 30-21: Configuring Cyrus When we created the user justin, we had the quota set to a default. If you want to allow subsequent users to have a higher (or lower) disk quota, you can set it (in kilobytes) on this screen. Click Commit to save your changes.
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760 Part V . SUSE Linux in the Enterprise Figure 30-20: Editing the Postfix server configuration Enabling SMTP-AUTH To enable SMTP authentication, change the drop-down box for authentication through SMTP-AUTH to On and click the Confirm button. Your users will now be able to configure their mail clients to send authentication information to the SMTP server before they attempt to send any mail. Note 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. Enabling Spam Prevention 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
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Chapter 30 . SUSE Linux OpenExchange Server 759 Figure 30-19: Creating a virtual user Configuring the Postfix Subsystem 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 enables your users to authenticate to the mail server when they are not on the trusted network. (See Chapter 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 similar to the one shown in Figure 30-20.
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758 Part V . SUSE Linux in the Enterprise For example, as we have already created the user justin, any mail for justin@wiley.com and justin@susebible.com will go to the same person, justin. For most people, this is fine because their organization may have a few domains that they have acquired over the years that they want to work across the organization. . A Postfix [P] virtual domain, on the other hand, segregates virtual domain users from each other. So justin@susebible.com and justin@wiley.com are seen as two separate email accounts. If you want mail from justin@wiley.com to be received by the user justin, you will have to tell Postfix to do this for you. Each virtual domain type has pros and cons, and you need to make a decision on what virtual domain type you want to use. We are going to use a Sendmail-style virtual domain because we have only a small mail server and want to let our users choose between having a wiley.com and a susebible.com address. When the domain has been created, suppose you want to make all mail for info@wiley.com go to the user justin. (Apparently the editors were so happy with the book that they asked Justin if he wanted a job looking after any general inquiries coming into Wiley!) In that case, you have to assign a virtual user to a real user. Mapping a Virtual User to a Real User To create a virtual user, you need to go back to the User section. Select the Create Virtual Users subsection. You will see a screen similar to the one shown in Figure 30-19. 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 for which you want to create a virtual user 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.
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Chapter 30 . SUSE Linux OpenExchange Server 757 Creating a Virtual Domain When the user has been created, you need to create the virtual domain for which you also want to receive mail. This machine is specifically for the SUSE Bible authors and editors, but we also want to be able to receive mail for the wiley.com domain. To create a virtual domain, select the Network Services section and then select the Virtual Domains subsection. You will arrive at the screen shown in Figure 30-18. Figure 30-18: Creating a virtual domain To create a new virtual domain, enter the new domain and press Add. This adds the domain to the SLOX configuration. Notice that there is a letter next to the domain on the domain list. This letter signifies what type of domain you are creating: . In a Sendmail [S] virtual domain, a single, flat namespace is used. If you have wiley.com and susebible.com as domains hosted on this mail server, you must use unique mail recipients.
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756 Part V . SUSE Linux in the Enterprise Figure 30-16: Searching for users Figure 30-17: Listing all information about a user
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Chapter 30 . SUSE Linux OpenExchange Server 755 Figure 30-15: Creating a new user So the user justin can be contacted on justin@susebible.com, jdavies@ wileybible.com, and justin.davies@susebible.com. A lot of email addresses for one person, but it does help when people need to guess your email address when they have lost your business card. Caution It is helpful to create these kinds of aliases for your users, but it does have a downside. If spammers can guess your email address, you could end up with unwanted mail. Check with your company policy on email aliases before you roll this out into production. When you are happy with the user, you can save the account by pressing Confirm. Checking the User Data If you want to view any data about a user on the system, select the Edit subsection (see Figure 30-16). You will be presented with a filter that you can use to narrow down a search for a user, or just leave it as * to list all users. Click Apply Filter to search for the users. When you have found the user account, select it and click User Data. You are presented with the details that you previously filled in for the user. If you want to be able to edit all information relating to a user, such as his or her birthday, title, and so on, click Long attribute list to get a screen like the one shown in Figure 30-17.
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754 Part V . SUSE Linux in the Enterprise Table 30-1 (continued) Section Description Network Services Configuration of miscellaneous network services and the creation of virtual domains. Tools LDAP browser, configuration file editing; send a mail to all users. Monitor Check the status of the mail queue, system load, services, and so on. Resources Manage groupware resources. Language System language. Log Out Self-explanatory. Tip Wherever you are in SLOX, you can always click the question mark to get help about the specific part of SLOX you are configuring at that time. The context-sensitive help icon (the question mark) is usually located at the top-right of the section you are working on, or next to the field about which you may want to find out more information. Managing Users The most important components of a mail system are the users and their accounts. Without these, there is no point in running a mail system. In this example, we create a new user called justin who will also receive mail for the virtual domain wiley.com. There are a few procedures that you need to go through that may not be obvious if you have never used SLOX before to create the virtual domain. We detail this in the rest of the section. Creating the User To create a user, click the User section and then the New subsection. You are presented with a form to fill in to create a new user (see Figure 30-15). We have added the user justin, with his full name, password, and alias information. Everything else in the entry is the default based on the questions asked during installation. Aliases An email alias enables justin to receive mail using a different email address from the default. Some organizations use the default First.Lastname@domain.tld; with this in mind, SUSE can create this alias by default for you (if you want). However, we have created another alias for the user justin, called jdavies, because this structure is also quite common.
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Chapter 30 . SUSE Linux OpenExchange Server 753 When logged in, you are presented with the initial configuration screen (see Figure 30-14). You can configure any aspect of SLOX through the web interface without having to know any Linux or SLOX-specific technology. Figure 30-14: The initial configuration screen There are numerous sections to the SLOX configuration interface. We will go through the most common ones throughout the rest of the chapter. Table 30-1 details what each section refers to. Table 30-1 SLOX Configuration Sections Section Description User Create, edit, and delete user accounts. You can also create virtual users here. Groups/Folders Create, edit, and delete user groups and shared folders. Mail Server Postfix/Cyrus configuration. Security Apache, SSL, and services security information. Continued
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