Supporting Messaging Clients

Require Authentication for Incoming Connections

There are three authentication methods available. You can choose to use one, two, or all three methods. By default, anonymous access is deactivated on SMTP virtual servers; some authentication credentials are required. To allow anonymous access, you must manually disable authentication on the virtual server.

Authentication Option Description
Anonymous access An account name or password is not required. Use this option to disable authentication for the SMTP virtual server.
Basic authentication An account name and a password are sent using clear text. Specify a Windows domain that is appended to the account name for authentication.
Integrated Windows authentication A Windows account name and password are authenticated using this option. This is the most secure authentication method, with sessions protected by Kerberos (if you have a pure Windows 2000 environment, including clients) or NTLM (all other environments).

This section contains the following topics: