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Hello there,
For Outlook connection in Fluent SMTP, we recommend generating the API and secret key using the email that you want to use as a From Email. So, if you would like to use [email protected] as from email then you need to generate the keys using that email.
Generating the API with other email might cause permission issues as Outlook have different permission for different accounts. Also, after generating the API kindly make sure that you are authenticating with the same email. In other words, the From email should be used to generate API keys and authenticate.
Thank you