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Certification error with SMTP connector

Hi experts,


I'm in the unfortunate situation where a customer has on-premise Exchange. I am working closely with their IT to try and set up a SMTP connection from Power Apps, but we have run into an issue that we cannot seem to solve.

error cert.PNG

Image of an error, the text reads "the remote certificate is invalid according to the validation procedure".


Would anyone be able to give a hint on how to solve this issue?


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