Hello I am getting a strange error code after creating a ticket

can anybody help with this error the ticket still gets created. even with this error

Thanks


Uncaught Exception
Expected response code 250 but got code "550", with message "550 5.7.1 Client does not have permissions to send as this sender
" in ./__swift/thirdparty/SwiftMailer/classes/SwiftMailer/Transport/AbstractSmtpTransport.php:422
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Hello I am getting a strange error code after creating a ticket