Bulk Email Verifier - Clean up your large mailing lists before you use them. Clean list increases your reputation in MailChimp, AWeber, or Campayn.
Grist - Grist makes it easy to transform spreadsheets into a custom database where data is truly actionable.
Email Verifier - Email verifier app lets you verify email.
Rows - The spreadsheet where teams work faster
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
UProc for Sheets - Boost your sales, marketing and IT tasks from Google Sheets