Selectable Recipient with Pipes, but in other shortcode

Hello,
I’m trying to add Selectable Recipient email(with PIPES fonctionality) to my contact form 7.

But the probleme is that I also want to get my email with a custom shortcode parsing a custum field of a custom post.
I have a custom post agency and a cutstom fields mail_agency.

So I create a new shortcode like this :

function get_the_agency($atts, $content = null) {
	$args = array(
		'post_type'		=> 'agency',
		'showposts'		=> '-1'
	);
	$query = new WP_Query($args);

	$list_agency ="";
	$mails_list = "";

	if ( $query->have_posts() ) while ( $query->have_posts() ) : $query->the_post();

		$mails_list .= ' "' . get_the_title() . "|" . get_field("mail_agency", $post->ID) .'"';
// get_field by advancedcustomfields plugin

	endwhile; wp_reset_postdata();

	$list_agency = '[select recipient-email id:agency-form ' . $mails_list . ']';

	return wpcf7_do_shortcode($list_agency);
}

add_shortcode( 'agency', 'get_the_agency' );

And if I put [agency] in my form, my shortcode is executed but the pipes fonctionality for the email adress won’t work (I think)
The value/text is good <option value="my_title">mytitle</option> but I’m unabled to send the form, It’s like recipient-email is empty…

But if I delete the first part of $mails_list :
$mails_list .= ' "' . get_field("mail_agency", $post->ID) .'"';

Everything work perfectly, my from send my email but all my email adresse are visible in my code …
<option value="email@gmail.com">email@gmail.com</option>

I also test to copy my return $list_agency shortcode directly in my contact form 7 admin and save, and everything works.

So How to can I do to make this work like in this exemple :

http://contactform7.com/selectable-recipient-with-pipes/

but with the possibily to get all my email adress dynamicly with a new shortcode ?

Please, help !!

http://wordpress.org/extend/plugins/contact-form-7/