system/libraries/Email.php
/**
		* Get the Message ID
		*
		* @return	string
		*/
Get the Message ID
@return       string
Get the Message ID @return string
protected function _get_message_id()
		{
			$from = str_replace(array('>', '<'), '', $this->_headers['Return-Path']);
			return '<'.uniqid('').strstr($from, '@').'>';
		}
protected function _get_message_id ( ) { $ from = str_replace ( array ( '>' , '<' ) , '' , $ this -> _headers [ 'Return-Path' ] ) ; return '<' . uniqid ( '' ) . strstr ( $ from , '@' ) . '>' ; }
Get the Message ID
 @return       string
Get the Message ID @return string