Letsextract https://letsextract.com/extract-emails-from-mailboxes.htm is a tool that allows you to parse emails from documents and mailboxes. It has a lot of other features, but this is the most important one—you can use it to extract all the email addresses from your documents, and then use those addresses for any purpose you want! It's really easy to use, too. Just open up Letsextract, click "Extract Emails," and choose a document or mailbox. Then click "Extract Emails." Voila!