What should I use instead of guessing which emails will bounce?

Instead of guessing, use email verification and bounce management.

Best options

1. Verify emails before sending

   • Run your list through an email validation service to catch:
     • invalid syntax
     • fake/disposable addresses
     • nonexistent domains
     • risky inboxes
   • Examples: NeverBounce, ZeroBounce, Kickbox, BriteVerify

2. Use real-time validation at signup

   • Check email addresses when users enter them in forms.
   • This stops bad addresses before they get into your database.

3. Monitor bounce reports

   • If you send emails through an ESP like SendGrid, Mailgun, SES, or Mailchimp, use their bounce/webhook data to automatically:
     • suppress hard bounces
     • retry or flag soft bounces
     • remove problematic addresses

4. Double opt-in

   • Ask users to confirm their email via a verification link.
   • This is one of the most reliable ways to ensure deliverability.

Practical recommendation

If you want the simplest approach:

• Validate at signup
• Verify your existing list before campaigns
• Automatically suppress hard bounces

If you want, I can recommend the best tool depending on whether you’re doing marketing email, transactional email, or app signups.