I am looking for an email extractor that can get emails from many different websites. It would crawl the websites and then extract the emails and put them in a mysql DB. I would want this crawler to keep crawling websites to find emails instead of just crawling one site and stopping. I would like for this to be multithreaded if possible Not sure if that is possible with PHP. This needs to be fast and efficient. I need to extract ALOT of emails in the least amount of time possible.