function bbp_get_topic_author_email( $topic_id = 0 ) {
		$topic_id = bbp_get_topic_id( $topic_id );

		// Not anonymous user
		if ( ! bbp_is_topic_anonymous( $topic_id ) ) {

			// Use topic author email address
			$user_id      = bbp_get_topic_author_id( $topic_id );
			$user         = get_userdata( $user_id );
			$author_email = ! empty( $user->user_email ) ? $user->user_email : '';

		// Anonymous
		} else {

			// Get email from post meta
			$author_email = get_post_meta( $topic_id, '_bbp_anonymous_email', true );

			// Sanity check for missing email address
			if ( empty( $author_email ) ) {
				$author_email = '';
			}
		}

		// Filter & return
		return apply_filters( 'bbp_get_topic_author_email', $author_email, $topic_id );
	}