Using Email connector - Authentication Unsuccessful

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Hi   I am trying to use the email connector in my application so I can send to SMTP relay but I am getting unsuccessful authentication every time   I am on premise running my application in a docker container, container port 25 is open and I can access the SMTP relay server from my server   SMTP Relay server is IP authorised rather than password so username and password is irrelevant   I have seen people do this and put in random username and password and it works successfully but I have had no success   Has anyone done this before successfully or can give me a clue as to what I am missing?   many thanks
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