Configuring Authentication for Outbound Messages

You can configure the SMTP site to provide the authentication credentials required by a receiving server. There are two types of authentication available: clear text and Windows NT Challenge/Response. With the clear text option, the account name and password of the server you're connecting to is transmitted in clear text. The Windows NT Challenge/Response option requires a Windows NT account name, domain, and password. You can also disable authentication, which is the default option.

The option set here can be overridden for a specific remote domain. This enables you to set the site authentication level to handle most of the transmissions, while allowing exceptions for individual addresses. The following table describes several configuration examples.

SMTP Site Transmissions Authentication Option

Messages are commonly sent to multiple addresses. Disable authentication for the site. If attempts to deliver messages to an address fail because of authentication requirements, add a remote domain for the address. Then enable authentication for the domain at the same level required by the server.

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 site using the same level. If you want to then send messages to other addresses, set up remote domains and set different authentication options. If you use this option, it is likely that the account name used is the one that identifies the computer set up as the smart host.

To disable authentication for outgoing messages

Select the Delivery property sheet.
Choose Outbound Security.
Select No authentication.

To set clear text authentication for outgoing messages

Select the Delivery property sheet.
Choose Outbound Security.
Select Clear text authentication, and then choose Change.
Under Account on Remote Host, type the account name and password of the computer you're connecting to.

To set Windows NT Challenge/Response authentication for outgoing messages

Select the Delivery property sheet.
Choose Outbound Security.
Select Windows NT Challenge/Response authentication, and then choose Change.
Under Windows NT Account on Remote Host, type the Windows NT account name, domain, and password of the computer you're connecting to.

SMTP Site Transmissions	Authentication Option
Messages are commonly sent to multiple addresses.	Disable authentication for the site. If attempts to deliver messages to an address fail because of authentication requirements, add a remote domain for the address. Then enable authentication for the domain at the same level required by the server.
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 site using the same level. If you want to then send messages to other addresses, set up remote domains and set different authentication options. If you use this option, it is likely that the account name used is the one that identifies the computer set up as the smart host.