Verifier - Weed out disposable, non-existent domains or invalid emails.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Validator.pizza - Free API to block 🗑 disposable emails
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
Antideo - Email, IP address and phone number validation API service
Apple Numbers - Numbers lets you build beautiful spreadsheets on a Mac, iPad, or iPhone — or on a PC using iWork for iCloud. And it’s compatible with Apple Pencil.