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Security Properties

Use the Security property page to enable security on outbound connections to other systems. Messages transferred from one Microsoft Exchange Server computer to another SMTP host may be encrypted or authenticated.

Getting to the Security property page

  1. In the Administrator window, choose a site, and then choose Connections.
  2. Double-click the Internet Mail Service.
  3. Select the Security tab.

Enabling Security for Outbound Connections

You can use Simple Authentication and Security Layer (SASL), Secure Sockets Layer (SSL), or Windows NT security on connections to other systems. You can provide the account, domain, and password that is effective for all connections, or you can provide separate security information for each domain you connect to.

Note   To ensure the strongest possible encryption over outbound connections, choose SSL encryption or use a Windows NT account with a non-blank password.

  1. Select the Security tab.
  2. Choose Add.
  3. Type the name of the remote e-mail domain.
  4. Choose a security type.

Option Description
No authentication or encryption No security enabled.
SASL authentication/SSL encryption Choose SASL/AUTH, SSL encryption, or both.
SASL/AUTH clear text password


Uses the AUTH LOGIN ESMTP extension to send the clear text account and password on the outbound connections.
SSL encryption SSL encryption is enabled. The STARTTLS ESMTP extension is used.
Windows NT challenge/response authentication and encryption Enables Windows NT security. Choose this option when the Internet Mail Service is used as a site connector and you want to encrypt data transferred over the Internet.