Configure Server-to-Server ETRN/ATRN Functionality in IIS (256655)

SUMMARY

Microsoft Internet Information Services (IIS) supports server-side ETRN/ATRN functionality, but does not support client-side ETRN/ATRN functionality. Therefore, IIS can be configured to queue messages for remotely triggered delivery, with the triggering command being issued by a remote client. IIS cannot itself be configured to contact another server and issue the ETRN command to another server.

To turn on server-side ETRN/TURN functionality, follow these steps:

Open the Internet Service Manager snap-in and create a remote domain.
Right-click the remote domain, and then click Properties.
On the General tab, click Allow incoming mail to be relayed to this domain.
Do one of the following:
- For simple ETRN functionality, click Queue messages for remote triggered delivery.
- For TURN functionality, click Queue messages for remote triggered delivery. Under Accounts authorized to use ATRN", click the Add button to add the user(s) allowed to authenticate and issue the TURN command.

MORE INFORMATION

The authentication is done during the Simple Mail Transfer Protocol (SMTP) session. A remote host connects to the server hosting the e-mail domain. The ETRN, ATRN, or TURN command is issued to retrieve the queued e-mail messages.

Before ATRN or TURN is issued, an account with permission to issue the TURN or ATRN command for the e-mail domain must be authenticated. RFC 2222 has more information on Simple Authentication Secure Layer (SASL), which is the authentication method used. AUTH is the SMTP authentication command. Accepted AUTH authentication methods are AUTH LOGIN, AUTH NTLM, AUTH GSSAPI, and AUTH=LOGIN.

IIS 5 expects the credentials to be sent as (NT Domain\User) or in the case of a workgroup (NT Machine\User), when using AUTH LOGIN. IIS 4 expects only the user name; the Windows NT machine name or Windows NT domain is not required in IIS 4.