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Microsoft Windows SharePoint Services sends alerts and other administrator messages by using an SMTP server. This feature is also required for end-users to request access to a site or list. You can specify which SMTP server to use, and set the e-mail address to use for sending alerts and receiving replies for all sites, by using the SharePoint Central Administration e-mail settings. You can also specify different settings for a specific virtual server. At either level, you can specify the following settings: outbound SMTP server, from address, reply-to address, and character set to use.
When you configure e-mail settings, one of the settings that you specify is the character set to use in e-mail. The default character set is 65001 (Unicode UTF-8), a standard character set that works well for most languages. You can choose a specific language code to apply instead, such as 1256 (Arabic [Windows]), but be aware that changing to a specific language code may cause the e-mail messages to be unreadable to clients of other language codes, for example, 1252 (Western European [Windows]).
If you want to use an SMTP server in Internet Information Services (IIS) to send outbound e-mail messages from Windows SharePoint Services, you must configure the SMTP server to allow anonymous access and to allow e-mail messages to be relayed. Note that the SMTP server that you use must have Internet access to be able to send messages to external e-mail addresses.
Note The SMTP Service for IIS is not installed by default. If you have not installed the SMTP Service, or you do not see the default SMTP virtual server in IIS, you must install the SMTP Service. For more information about installing, configuring, or managing the SMTP Service, see the Help system for Internet Information Services (IIS) Manager.