Error "4.7.4 The TLS configuration on the server is incomplete or faulty."

What does the temporary rejection with the error "4.7.4 The TLS configuration on the server is incomplete or faulty. The message cannot currently be delivered. Try again later." mean?

This indicates that the TLS certificate for authentication for your Office 365 has not been issued successfully.

The most common reason for this is that the certificate has already been claimed by another NoSpamProxy instance. This is possible if a test environment was previously used or if you have switched from an on-premises version to a cloud version or vice versa. The corresponding error "The TLS identity was already claimed by another company" can be found in the event log or under key requests.

This security mechanism can only be checked and reset by the NoSpamProxy team. All you need to do is send us a message track from the message tracking and name the Office 365 tenant concerned.

See How to create log files