This scans text and returns every email address it finds, discarding the surrounding content.
Typical sources
Exported contact records, a document listing contributors, a page of published contacts, or a thread where addresses are scattered through the replies.
Clean up afterwards
Extracted lists almost always contain duplicates and often contain role addresses like info@ and support@ that may not be the ones you want. Deduplicate, then filter.
Use it lawfully
Extraction is a data-handling operation, and what you may do with the results is governed by privacy law and anti-spam regulation regardless of how the addresses were obtained.
Try it: Extract Email Addresses from Text on SeoWolf's Notepad.