Mailgun - Version 1.4.4682 Mailgun is email marketing software that affords you to extract email addresses from results of leading search engines, and deliver your messages to these addresses.Mailgun is doing searches on specified web sites, such as Google or Yahoo. As a result of searches it creates the database of URLs for further emails extracting, you can add URL and email manually as well. As soon as all searches are finished, just write your message in editor and tick necessary recipients.