To remove a domain, highlight the domain object and click the Delete shortcut (or right-click the object and select Delete from the context menu). Be aware that when you remove a domain, you remove all the mailboxes that the domain hosts. If you delete a domain that uses Encrypted Password File authentication, the names of all hosted mail accounts in that domain will be lost. If the domain uses the Local Windows Accounts or AD authentication method, the accounts will remain on the server or in AD. If you want to move a domain, you must stop the POP3 service, copy the domain to the new root mail location, then update the root mail location in the Server Properties dialog box. Note that all mail domains must reside in the same location—you can't store them on different partitions.
To add a mailbox, select the correct domain, click New Mailbox (or right-click the domain and select Properties, New, Mailbox) to display the Add Mailbox dialog box, which Figure 3 shows. If you use the Local Windows Accounts or AD authentication method and want to create an associated user account to accompany the mailbox, select the Create associated user for this mailbox check box. If the user for whom you're creating a mailbox already has a local or AD account, clear the check box. In the latter case, the user account name and mailbox name must be the same.
Be aware that mailboxes are subdirectories of the hosting mail domain directory. For example, if you create a mailbox called Rooslan in the certtutor.net mail domain, that mailbox's messages reside in the \%mailroot%\certutor.net \p3_rooslan.mbx directory. Therefore, the POP3 service doesn't handle the use of one mail prefix across multiple domains as well as other mail services (e.g., Exchange). If you need to use one mail prefix for multiple domains, consider a solution other than the Windows 2003 POP3 service.
Configuring the SMTP Service
The POP3 service lets clients receive mail. The partner to this service is the SMTP service, which lets users send mail. The SMTP service, unlike the POP3 Service, isn't new to Windows 2003 and has accompanied earlier versions of Microsoft IIS. You can use the MMC IIS snap-in to access the SMTP service.
Each time you use the POP3 Service snap-in to create a mail domain, you also create an associated SMTP domain. The properties of the SMTP service are central, and you must configure them by editing the properties of the SMTP virtual server, as Figure 4 shows. Administrators need to ensure that the SMTP service isn't configured as an open relay, which spammers can exploit.
You can configure the SMTP service to accept communication only from a specific set of IP addresses or domain names. You can also configure the service to limit the number of messages per session and the number of recipients per session to discourage spammers, who prefer to send thousands of messages, from using your server. Also consider configuring the SMTP service to deny mail relay and to require authentication from clients who attempt to send email. Be sure to test whether a server passes a relay check before exposing it to the Internet. In line with the Microsoft Trustworthy Computing initiative, administrators typically configure the Windows 2003 SMTP service to be secure and to prevent an open relay.
Using the Remote Administration Tool
If you've installed the Web Interface for Remote Administration, you can use a standards-compliant Web browser to access the functions of the POP3 Service snap-in. Some of the HTML remote administration tools require Microsoft Internet Explorer (IE) running on a Windows platform because they use a special ActiveX plugin, but you can run the POP3 server section of the tools from Netscape Navigator or Mozilla.org's Mozilla on various platforms.
The URL for the remote administration tools is https://servername:8098. You can use the Web interface to configure the Mail Server Port, Logging Level, Root Mail Directory, and Authentication Method server properties. As with MMC, you can alter the authentication method only if no domains are present on the server.
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