Troubleshooting

This section covers common issues you might encounter when using Mailtrap Email API/SMTP and their solutions.

Common Issues

Authentication & Authorization

• Unauthorized Error (401 Code) - Issues with API credentials, tokens, or domain verification

• Sending from Domain Not Allowed - Domain verification and FROM address problems

Email Delivery

• From Header Domain Mismatch - Fixing FROM header configuration issues

SSL & Security

• SSL Cipher Overlap Error (Error 1001) - Custom tracking domain SSL certificate issues

Third-Party Services

• MS Office 365 Quarantine - Mailtrap emails going to Office 365 quarantine

Need More Help?

If you don't find the solution to your problem here:

1. Check our FAQs for general questions

2. Contact support at [email protected]

3. Visit the API documentation for technical details