Sending a test message in Outlook fails with Plesk mail server: None of the authentication methods supported by this client are supported by your server.

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    Seb

    The solution did not work for me.

    I set smtpd_sasl_security_options = noanonymous in main.cf, but also had to modify master.cf
    There, I set smtpd_enforce_tls=no and removed smtpd_tls_security_level=encrypt from the submission line.

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