Sent mail HTML ISSUE

I’ve problem with email sent after module submission.

With “Use HTML content type box” checked
I cannot see html styled email but html tags

i receive e-mail like as

MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: 8bit

<p>Da: Fabio Gulotta <[email protected]></p>
<p>Oggetto: PRENOTAZIONE PARCHEGGIO SETTIMANALE PER CROCIERA DAL 2015-10-14 AL 21/10/2015</p>
<p>I DATI</p>
<p>NOME: Fabio Gulotta
EMAIL: [email protected]
TELEFONO: 1121212113
TARGA: CM5565245</p>
<p>Corpo del messaggio:</p>
<h1>SADFDDASSDA</h1>
<p>–
Email inviata da modulo prenotazione del Sito http://www.asdasdasdasdas

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