arm_add_new_optin_settings

This Filter will be useful to add custom email marketing tool options settings.

Hook Type: Filter
Usage:
add_filter( 'arm_add_new_optin_settings', 'your_function', 10, 2);
function your_function($content, $email_settings) {
    //$content Email Tool Options HTML.
    //$emailTools Email Tool Settings.
    $content = "Add Your Options HTML Here.";
	return $content;
}
Parameters:
$content
Email Tool Options HTML
$emailTools
Email Tool Settings