<?php
function are_email_errors_enabled() {
	return (defined('EMAIL_ERRORS_TO_EMAIL') && false !== EMAIL_ERRORS_TO_EMAIL && 0 !== EMAIL_ERRORS_TO_EMAIL);
}

function wp_mail_error($subject, $message, $headers = '', $attachments = array()) {
	if (! are_email_errors_enabled()) {
		return;
	}

	// EMAIL_ERRORS_TO_EMAIL should be set to a valid email or a 'marker-of-somekind',
	// since defined constants can't be arrays.
	// If the latter, then the filter should produce the valid email or array of emails.
	$to = apply_filters('email_errors_to_email', EMAIL_ERRORS_TO_EMAIL);

	wp_mail($to, $subject, $message, $headers, $attachments);
}