from site:
https://www.ibm.com/docs/en/content-collector/4.0.0?topic=reports-enabling-tls-connections-in-lotus-domino

Procedure

To configure Lotus Domino to use TLS connections:

In the Domino Administrator Client, navigate to Configuration > Server > Configurations.
Open the configuration document for the server that you want to configure.
Select Router/SMTP > Advanced > Commands and Extensions.
Under SSL negotiated over TCP/IP port, select Required.
Navigate to Configuration > Server > Current Server Document.
Select Ports > Internet Ports > Mail.
Under SSL port number for Mail (SMTP Outbound), specify the port 465.
Under SSL port status for Mail (SMTP Outbound), select Enabled.


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