function set($key,$val) {
		$key=$this->fixheader($key);
		return $this->headers[$key]=$val;
	}
function set($key,$val) {
		$key=$this->fixheader($key);
		return $this->headers[$key]=$val;
	}
function set ( $ key , $ val ) { $ key = $ this -> fixheader ( $ key ) ; return $ this -> headers [ $ key ] = $ val ; }
Bind value to e-mail header
@return string
@param $key string
@param $val string
Bind value to e - mail header