SMTP - ERROR: AUTH not accepted from server: 504 5.7.4 Unrecognized authentication type

Hello, everyone has problem sending email through phpmailer and I get this error

my code is:

<br/>
$mail = new PHPMailer;<br/>
        $mail->ClearAddresses();<br/>
        $mail->IsSMTP();<br/>
        $mail->SMTPDebug = 1;<br/>
        $mail->IsHTML(true);<br/>
        $mail->Port = 25;<br/>
        $mail->Host = 'mail.dominio.com';<br/>
        $mail->SMTPAuth = true;<br/>
        $mail->Username = '[email protected]';<br/>
        $mail->Password = 'mipassword';<br/>
        $mail->SetFrom('[email protected]', 'Prueba');<br/>
        $mail->Subject = 'Correo de Prueba';<br/>
        $mail->SMTPSecure = 'tls';<br/>
        $mail->AltBody = '';<br/>
        $mail->CharSet = 'UTF-8';<br/>
        $mail->MsgHTML('Mensaje de Prueba');<br/>
        $mail->AddAddress('[email protected]');<br/>
        if (!$mail->Send()) {<br/>
            echo "Error: ".$mail->ErrorInfo;<br/>
        } else {<br/>
            echo "Mensaje enviado correctamente";<br/>
        }<br/>

and the error is this:

<br/> SMTP -> ERROR: AUTH not accepted from server: 504 5.7.4 Unrecognized authentication type<br/>
SMTP -> ERROR: RCPT not accepted from server: 550 5.7.1 Unable to relay<br/>
SMTP Error: The following recipients failed: [email protected] Error: SMTP Error: The following recipients failed: [email protected]<br/>

I thank you in advance