Understanding High Email Campaign Bounce Rates

Last updated: September 23, 2026

If you notice unusually high bounce rates in your email campaign metrics, there are several potential causes to investigate:

Common Causes of High Bounce Rates

  • Outdated or invalid email addresses in your prospect list

  • Email verification not enabled in workspace settings for enriched prospect emails

  • Email server configuration issues

  • Prospects marked as "paused" in the system

  • Temporary delivery issues with recipient email servers

How the System Handles Bounced Emails

The system automatically suppresses bounced email addresses to prevent future delivery attempts. Once an email bounces, that address will never be contacted again, regardless of your email validation settings.

  • Prospects → Statistics → Bounced Emails - View overall bounce statistics

  • Campaign Statistics → Bounced Emails - See bounce counts for specific campaigns

  • Inbox Filters → Statistics + Bounce Rate - View all conversations where bounces occurred

  • Bounced emails appear with a Failed status in the interface

What to Do

  1. Check your prospect list status - verify that your prospects are not marked as "paused" in the system

  2. Review your email list quality:

    • Remove any obviously invalid email addresses

    • Verify the format of email addresses

    • Consider using an email verification service

  3. If bounce rates remain unusually high after these checks, contact our support team for further investigation

Note: Enable the "Verify prospect's emails before sending" toggle in your workspace settings to automatically validate enriched prospect emails before sending. The system automatically suppresses bounced addresses to prevent future delivery attempts. If you see unexpectedly high bounce rates even with verification enabled, or if many prospects are showing as "paused," check Prospects → Statistics → Bounced Emails to review bounce data, or contact support for assistance.