SMTP: How the SMTP World Communicates with the Gateway

 Last reviewed: October 20, 1997
Article ID: Q87047
3.00 MS-DOS kb3rdparty

The information in this article applies to:

  • Microsoft Mail Gateway to SMTP, version 3.0

The Microsoft Mail Gateway to SMTP always connects to the designated SMTP host to send messages. The gateway receives messages from any host that can connect to the gateway.

When using TCP as the transport mechanism, a TCP connection is made by the sender to the receiver's service port 25. A host that wants to send mail to the gateway initiates a connection to the gateway's service port 25.

Additional reference words: 3.00 pcmail
KBCategory: kb3rdparty
KBSubcategory: MailGWSMTP

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Last reviewed: October 20, 1997
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