Topic Last Modified: 2007-01-24

The following table shows the four binding types that determine the level of authentication that is used for connections. The option that you select affects other options.

Binding type Description

Anonymous

No authentication is required. Select this option when the server does not require account and password information.

Plain text

This option enables the transmission of account information and passwords in clear text. When this option is selected, account and password information is required. Be aware that transmitting passwords in clear text is not recommended because information that is not encrypted can be read by unauthorized or malevolent parties.

Windows SSPI

The client and server negotiate to determine which level of authentication is acceptable by both, and use the strongest method that is available. When this option is selected, account and password information is required.

Service account

This option uses the account information of the user under which the SMTP service is running. This is controlled by the settings configured by using Services, under Administrative Tools.