About this task

The outbound port settings apply to all outbound SMTP sessions. If you change an outbound port number to a nonstandard value, the server cannot establish SMTP connections with servers that listen for SMTP requests on the standard port. Similarly, if you set up the server to send SMTP over SSL only, disabling the outbound SMTP TCP/IP port, the server cannot establish SMTP connections with a remote server that accepts SMTP connections over the TCP/IP port only.

Procedure

1. From the Domino Administrator, click the Configuration tab and then open the Server document for the server that runs the SMTP service.

2. Click the Ports -> Internet Ports -> Mailtab.

3. In the Mail (SMTP Outbound) column, complete these fields, and then click Save & Close:

Table 1. SMTP Outbound options

Field	Enter
TCP/IP port number	The number of the TCP/IP port on the remote server to which Domino attempts to connect when initiating an SMTP session. The default and industry standard port for SMTP connections over TCP/IP is 25. Specify a nonstandard port only if this Domino server makes all of its outbound SMTP connections over TCP/IP to a server that uses the nonstandard port.
TCP/IP port status	Choose one: Enabled - The Domino SMTP Router connects to the designated TCP/IP port number on a remote server to initiate an SMTP session. If the SSL port status is also set to Enabled, the Router attempts to use the SSL port first and uses the TCP/IP port only if it cannot connect to the SSL port. Disabled (default) - The Domino SMTP Router cannot initiate an SMTP session using the TCP/IP port on a remote server. Negotiated SSL - The Domino SMTP Router connects to the designated TCP/IP port on a remote server to initiate an SMTP session. If the remote server advertises STARTTLS during the EHLO greeting, Domino issues a STARTTLS command to request that the remainder of the session be encrypted using SSL. If the remote server does not support STARTTLS, an unencrypted TCP/IP session ensues.
SSL port number	The number of the SSL port on the remote server to which Domino attempts to connect when initiating an SMTP session. The default and industry standard port for SMTP connections over SSL is 465. Specify a nonstandard port only if this Domino server makes all of its outbound SMTP connections over SSL to a server that uses the nonstandard port.
SSL port status	Choose one: Enabled - The Domino SMTP Router connects to the designated SSL port number on a remote server to initiate an SMTP session. If the Router cannot connect to the SSL port and the TCP/IP port is also enabled on both the Domino server and the remote server, Domino makes a second attempt to connect, using the designated TCP/IP port. Disabled (default) - The Domino SMTP Router cannot initiate SMTP sessions over the SSL port of a remote server.

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