My Campaign Has a Very High Bounce Rate? How Can I Find Out What’s Happening?

If you notice a high bounce rate on your campaign, follow these steps to diagnose and address the issue:

Immediate Actions

1. Pause your campaign to stop further sending.

2. Pause any warmup processes associated with the sender email accounts involved.

Investigate Bounce Reasons

1. Open the affected campaign in EmailBison.

2. Navigate to the Replies tab, this directs you to the Master Inbox filtered for messages related to that campaign.

3. Select the “Bounced” folder to view detailed bounce messages explaining why emails were rejected.

Common Causes of High Bounce Rates

1. Sending volume limits exceeded: Your email service provider (ESP) may block outgoing emails if you send too many at once.
   

2. Corporate spam filters: Receiving servers like Proofpoint or Barracuda may block your emails due to strict filtering rules.
   

3. Microsoft tenant threshold errors: If using Microsoft accounts, you might hit sending limits resulting in “Tenant threshold limit exceeded” errors. Consult your Microsoft reseller or contact support for guidance on appropriate limits.
   

4. Unverified contact lists: Sending to invalid or non-existent email addresses because the list wasn’t properly verified.

Next Steps

1. Review bounce reasons carefully to identify patterns.

2. Adjust sending volume or list hygiene as needed.

3. Contact your email provider or our support team for help if you encounter persistent issues.