The real value of this project is a fairly complete list of bounce snippets found in returned email. Using this list, we can analyze the reason why an email bounced. Is the cause:
OK: received a delivery notification/status Temporary: could not be delivered but will be retried Permanent: the delivery failure was fatal Blocked: denied by a SPAM Filter or firewall
The result code of this component will let you take action such as notifying the original sender, retrying the delivery or unsubscribing the recipient from a list.
This code has been used in production for ~4 years and is quite stable. New bounce signatures appear all the time though, so consider posting new ones that are not found (result code = -1) to the forums for future inclusion.