bp_email_get_redirect_to_customizer_url()

function bp_email_get_redirect_to_customizer_url() {
	$switched = false;

	// Switch to the root blog, where the email posts live.
	if ( ! bp_is_root_blog() ) {
		switch_to_blog( bp_get_root_blog_id() );
		$switched = true;
	}

	$email = get_posts( array(
		'fields'           => 'ids',
		// 'orderby'          => 'rand',
		'post_status'      => 'publish',
		'post_type'        => bp_get_email_post_type(),
		'posts_per_page'   => 1,
		'suppress_filters' => false,
	) );

	$preview_url = admin_url();

	if ( $email ) {
		$preview_url = get_post_permalink( $email[0] ) . '&bp_customizer=email';
	}

	$redirect_url = add_query_arg(
		array(
			'autofocus[panel]' => 'bp_mailtpl',
			'bp_customizer'    => 'email',
			'return'           => rawurlencode( add_query_arg(
				array(
					'post_type'              => bp_get_email_post_type(),
				),
				admin_url( 'edit.php' ) ) ),
			'url'              => rawurlencode( $preview_url ),
		),
		admin_url( 'customize.php' )
	);

	if ( $switched ) {
		restore_current_blog();
	}

	return $redirect_url;
}