Short description of ProCrawl 1.33: ProCrawl high speed email extractor will search mail servers for emails. This is the ultimate way to find emails since they are verified as they are collected. The software will simulate the sending of an email, but without sending any email it will stop after the mailserver replies and tells you if the recipient is valid or not. If you are on a DSL or Cable connection you can with ease expect to find several million emails/hour.