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Correct the default value of TLS / SSL port from 465 to 25

Port 465 for TLS / SSL has been deprecated, but the default value on the server doc is 465.  This default value should be changed to 25.  This is found on the server doc, Ports - Internet Ports - Mail, SMTP Outbound, SSL Port Number.

Also, the default value for TCP/IP port status should be Negotiated SSL rather than Enabled and the default value for SSL Port should be set to Disabled so TLS will be used by default.

Here is a related idea too:  https://domino.ideas.aha.io/ideas/DOMINO-I-518


  • Guest
  • Jan 9 2019
  • No Plans to Implement
  • Attach files
  • Guest commented
    30 Jul, 2020 07:28am

    Yes, but:


    RFC also acknowledges that there is a defacto difference between RFC definition and current practice.

    Current practice is SMTP over TCP 25 with StartTLS, where encryption is agreed upon.

    Isn't it?

  • Admin
    Thomas Hampel commented
    29 Jul, 2020 01:34pm

    Port 465 is the correct default port for SMTP/TLS for clients submitting mails to the server - for details see https://tools.ietf.org/html/rfc8314