Comment #12 on issue 2524 by email is no response

i am facing the same problem ,and i tried to change headers['From'] = from_email" to "headers['From'] = sender",but it still not work,the error log still shows that "SMTPDataError: (550, '5.7.1 Client does not have permissions to send as this sender')"

but the default user can send the email successfully and others can not.
i remember that everyone can send the request email before the email server upgrate,and now we login in email server with username like "username" rather than "" before

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