HCL Domino Ideas Portal

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Status Needs Review
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.

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  • Admin
    Thomas Hampel
    Jul 19, 2025
    What preventsa MTM attack in this case?
    1 reply
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