Bulk Sender Lint - Gmail, Yahoo, Outlook — Licence

Free scope
  Check the file you have open - every check, with the rule it comes from, the date it took effect and the line is free for any use, personal or commercial, for as long as you keep the
  extension installed, and the online check at the product page is free without registration.

Paid scope
  Sweep every file in the workspace and write a dated evidence report you keep - $29 once, one licence key per person or team seat; a deliverability consultant bills $150-$250 an hour is the paid part. It asks for a licence key issued at purchase (one seat, one key). The key is checked against the payment provider and
  cached locally for 30 days so it keeps working offline.

Redistribution
  You may not resell, re-host or bundle this extension or its rule set. The rule set and the
  engine are provided as-is; check results are advisory and do not constitute legal advice.

(c) ReadyStack — https://getreadystack.com
