5. Troubleshooting & Frequently Asked Questions (FAQs)

5.1 Common Email Validation Issues

Why do I see many "catch-all" emails in my list?

Catch-all emails are associated with domains that accept all incoming emails, even if some addresses do not exist. These emails are risky because they do not guarantee deliverability. If you see many catch-all emails, consider segmenting them separately and testing small batches before large-scale campaigns.

What to do if my list has a high percentage of invalid emails?

A high percentage of invalid emails may indicate outdated or purchased lists. To resolve this:

· Ensure you collect emails through verified opt-in methods.

· Use No2Bounce's real-time API to prevent invalid sign-ups.

· Regularly clean and update your email lists.

Why are some emails returning as "unknown"?

An "unknown" result means No2Bounce could not determine the email’s validity due to the recipient server’s response settings. Some servers are configured to block verification attempts, resulting in this status. To reduce the number of "unknown" emails, consider:

· Sending test emails to measure actual bounce rates.

· Excluding unknown emails from critical campaigns.

5.2 API & Integration Issues

How to resolve API authentication errors

API authentication errors occur when:

· The API key is incorrect or expired.

· The request headers do not include the correct authorization credentials. To fix this:

1. Verify your API key in the API Keys section.

2. Ensure your request headers include Authorization: Bearer YOUR_API_KEY.

3. Check for typos or missing parameters in the request.

Why is my API request failing?

API failures can result from:

· Exceeding rate limits: Check your plan's API request limit.

· Incorrect API endpoints: Ensure you’re using the correct URL from the documentation.

· Invalid request format: Verify JSON or query parameters are correctly structured.

How to troubleshoot third-party integration issues

If No2Bounce is not working with your email marketing platform:

1. Confirm API keys and authentication settings.

2. Check if the integration plugin or third-party connector is updated.

3. Test API calls manually before automating them.

4. Contact No2Bounce support for specific integration issues.

5.3 General Troubleshooting

Why are my emails still bouncing after validation?

If your emails are bouncing even after validation:

· Ensure you are not sending to catch-all or unknown emails.

· Monitor email content, as spammy language can trigger filtering.

· Warm up your email-sending domain if it is new.

· Check your sending reputation and IP blacklist status.

How to fix high bounce rates after cleaning an email list

To reduce bounce rates:

1. Remove all invalid, disposable, and role-based emails.

2. Segment catch-all and unknown emails and test in smaller batches.

3. Use a dedicated IP with proper domain authentication (SPF, DKIM, DMARC).

4. Avoid purchased or scraped email lists.

How to contact No2Bounce support for technical issues

If you experience persistent issues, reach out to No2Bounce support through:

· Email Support: Contact via support@no2bounce.com.

· Live Chat: Available on the No2Bounce website.

· Help Center: Access troubleshooting guides and FAQs.

‍