Found a bug, want a provider guide added, have a feature idea, or a privacy question? The details below reach the right inbox.
For general questions, support, and feedback:
For privacy-related questions or data requests:
We aim to reply within a few business days.
What to include
To help us respond quickly, please include as much of the following as applies:
- A clear description of the issue or request.
- The SMTP host, port, and security mode you were testing (never send us your password).
- The relevant lines from the live transcript — credentials are already redacted, so it is safe to copy and paste.
- Your browser and operating system if you are reporting a UI problem.
Common topics
- Bug reports — something not working as expected in the tool or a guide.
- Feature requests — a capability you would like to see added.
- Guide suggestions — a provider or scenario you want a setup or troubleshooting guide for.
- Privacy — questions about how your data is handled (see our Privacy Policy).
- Terms & Acceptable Use — questions regarding authorized server testing or service policies (see our Terms of Service).
A note on email delivery
SMTP Tester verifies SMTP submission — it cannot diagnose why a specific message landed in spam or failed delivery for your account with a third-party provider. For provider-specific account issues, your email provider's support is the best first stop. Our guides cover the most common authentication and connection problems.