HCL Domino Ideas Portal

Welcome to the #dominoforever Product Ideas Forum! The place where you can submit product ideas and enhancement request. We encourage you to participate by voting on, commenting on, and creating new ideas. All new ideas will be evaluated by HCL Product Management & Engineering teams, and the next steps will be communicated. While not all submitted ideas will be executed upon, community feedback will play a key role in influencing which ideas are and when they will be implemented.


For more information on products and upcoming events around #dominoforever, please visit: HCL Domino Page


Add a new idea Subscribe
Status No Plans to Implement
Workspace Domino
Categories Security
Created by Guest
Created on Jun 27, 2025

RELATED IDEAS

Allow starttls even with bad certificates

as of 2025-06 if you configure a Domino server (14.5 but also previous ones) to negotiate outgoing smtp with STARTTLS on port 25 Domino accepts to perform only TLS handshaking:

- with other servers that support STARTTLS

- that have a valid certificate (for example if a recipient server has a certificate issued for a name different from the host name the session is not established)

The behavior with a server that supports SRTARTTLS but with a non-responsive certificate causes a retry for hours with the message remaining in mail.box.

Inserting the variable in NOTES.INI

RouterFallbackNonTLS=1

allows routing by giving up encryption, Domino will use the unencrypted port 25, thus exposing outgoing SMTP sessions to loss of control and possible interception.

It would be useful to have a setting that allows, like other SMTP servers, to allow the STARTTLS connection with any recipient certificate.

  • Attach files
  • Guest
    Jul 9, 2026

    Are you sure the certificate is checked? I never ran into any issue with a remote site not having a valid cert.

    I would want to ask for the opposite functionality:

    Have a way to enforce certificate validation for specified recipient domains to allow qualified STARTTLS.
    Or the other way round to always validate and have a way to configure domains to skip this validation.

    We need more control in this area for incoming and more important outgoing messages.


    Reply
  • Admin
    Thomas Hampel
    Jul 19, 2025

    What prevents MTM attack in this case?

    1 reply
                                    Copyright © 2025 HCLSoftware Limited