HTML emails not sent with custom wp_mail function

Hi,
we use a custom wp_mail function to sent datas from a front-end ACF form. This specific email is not received with the html template that is set up in the network admin. For every othe email it is working fine.

Here is the code that we try to send :

$name = get_field('option_title','option');
	$email = get_option( 'admin_email' );

	// email data
	$to = get_field('form_gift_email', $post_id);
	$headers = 'From: ' . $name . ' <' . $email . '>' . "\r\n";
        $headers .= "MIME-Version: 1.0\r\n";
        $headers .= "Content-Type: text/html; charset=UTF-8\r\n";
	$subject = __('Résumé de votre participation à notre liste de mariage','union');
        $message = ''.get_field("option_message_email","option").'
            <table>
                <tr>
                    <td>
                        '. __("Nom","union").'
                    </td>
                    <td>
                        '.__("Description","union").'
                    </td>
                    <td>
                        '. __("Prix Unitaire","union").'
                    </td>
                </tr>';
                for($i=0 ;$i < $nbArticles; $i++){
                    $message .= ' <tr>
                        <td>
                            '. $_SESSION["panier"]["libelleProduit"][$i].'
                        </td>
                        <td>
                            '. $_SESSION["panier"]["contentProduit"][$i].'
                        </td>
                        <td>
                            '. $_SESSION["panier"]["prixProduit"][$i].'
                        </td>
                    </tr>';
                }
            $message .= '</table>
            <table class="social" width="100%">
                <tr>
                    <td>
                        <!-- column 1 -->
                        <table align="left" class="column">
                            <tr>
                                <td>
                                    <h5 class="">'. __("Ci-dessous nos coordonnées bancaires","union").'</h5>
                                </td>
                            </tr>
                            <tr>
                                <th>
                                    '. __("Nom du compte: ","union").'
                                </th>
                                <td>
                                    '. get_field("option_nom_du_compte","option").'
                                </td>
                            </tr>
                            <tr>
                                <th>
                                    '. __("Numéro du Compte:","union").'
                                </th>
                                <td>
                                    '. get_field("option_numero_du_compte","option").'
                                </td>
                            </tr>
                            <tr>
                                <th>
                                   '. __("Nom de la banque: ","union").'
                                </th>
                                <td>
                                    '. get_field("option_nom_banque","option").'
                                </td>
                            </tr>
                            <tr>
                                <th>
                                    '. __("Code guichet: ","union").'
                                </th>
                                <td>
                                    '.get_field("option_code_guichet","option").'
                                </td>
                            </tr>
                            <tr>
                                <th>
                                    '. __("IBAN: ","union").'
                                </th>
                                <td>
                                    '.get_field("option_iban","option").'
                                </td>
                            </tr>
                            <tr>
                                <th>
                                    '. __("BIC/Swift: ","union").'
                                </th>
                                <td>
                                    '. get_field("option_bic","option").'
                                </td>
                            </tr>

                        </table><!-- /column 1 -->
                        <span class="clear"></span>	

                    </td>
                </tr>
            </table><!-- /social & contact -->';

	// send email
	wp_mail($to, $subject, $message, $headers );

Thanks for your help!