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Postfix with M365 relay giving problems

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trying to setup my VPS with postfix and M365 as a relay host. Read several tutorials, but for some reason none of them does the job.Followed this instruction enter link description here, but postfix resp. M365 is throwing this error:

Postfix Log

My main.cf looks like this main.cf

This is sasl_password: sasl_password

I used an app password from M365 instead my regular password for that account.

Any ideas? Read somewhere that postfix uses basic auth fo rcommunication to M365, but as I am informed basic auth was disabled later on this year by microsoft.

cheers, toddehb

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