“from” email header

Hello, thanks for your excellent plugin.
I’m dealing with email issues.
My web hosting provider says I can only send emails with specific approved sender mails and I succeeded testing with a whitelisted email address with “Check & Log Email” plugin.
Thus, I need to change ERE email headers to this address but I can’t find this settings, so I’m trying to filter the “from” header in the wp-background-process.php function “ere_send_email”:

add_filter('ere_contact_mail_header', 'cambia_remitente');
function cambia_remitente($encabezado_mail)
{
	$encabezado_mail[] = 'From: Merino Propiedades <[email protected]>';
	return $encabezado_mail;
}

But it didn’t work.
P.S. I disabled the contact-agent template from the main container of the single property page and placed it as a widget on the side bar. You can test on my web-site.

The page I need help with: [log in to see the link]