Supporting Messaging Clients

Configure Authentication for Outbound Messages

You can configure the SMTP virtual server to provide the authentication credentials required by a receiving server. There are three types of authentication available: anonymous, basic (clear text), and Integrated Windows authentication. Anoymous requires no authentication. With the clear text option, the account name and password of the server you're connecting to are transmitted in clear text. Integrated Windows authentication requires a Windows account name and password.

Note   In most cases it may be more practical to configure outbound authentication on a connector. Connectors only send e-mail to specific remote domains and are thus more suited for making exceptions for certain addresses, whereas configurations made on an SMTP virtual server affect all messages.

The following table describes the two basic configuration scenarios:

SMTP Transmissions Authentication Option
Messages are commonly sent to multiple addresses. Disable authentication for the SMTP virtual server. If attempts to deliver messages to an address fail because of authentication requirements, configure an SMTP connector to that address and set the required authentication level there.
Messages are commonly sent to one address, which requires authentication. Determine what level of authentication is required to connect. Then enable authentication for the SMTP virtual server using the same level. If you want to then send messages to other addresses, set up connectors and set different authentication options accordingly.

To configure authentication for outgoing messages:

  1. Start System Manager
    On the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
  2. Navigate to the SMTP virtual server.
    1. Servers
    2. Server
    3. Protocols
    4. SMTP
    5. SMTP virtual servers
    6. SMTP virtual server
  3. Right-click the SMTP virtual server, and then click Properties.
  4. On the Delivery tab, click Outbound Security.
  5. In Outbound Security, select one of the following options:
    • To disable outbound authentication, click Anonymous and clear all other options.
    • To set basic authentication for outgoing messages, click Basic authentication, and then under User name and Password, type the account name and password that will grant you access to the computer you are connecting to.
    • To set Integrated Windows authentication for outgoing messages, select Integrated Windows authentication, and then under Account and Password, type a Windows account name and password that will grant you access to the computer you are connecting to.

Related Topics

Outbound Security (on an SMTP Connector)