Free Online SMTP Checker Tool
Looking for a reliable way to test SMTP settings and diagnose email delivery issues? Our Free SMTP Checker Tool is the perfect solution. You can instantly test SMTP server connection, port availability, authentication status, and simulate email delivery — all in one convenient tool.
What is an SMTP Checker?
An SMTP checker (also called an SMTP tester or SMTP test tool) is used to verify whether your SMTP server settings are correctly configured and accessible. With our SMTP test online, you can:
- Test SMTP server connectivity
- Verify SMTP authentication (username & password)
- Choose between Auto, SSL, and TLS security modes
Whether you're managing transactional email systems, testing campaign delivery, or troubleshooting issues, our SMTP checker online helps you verify if the SMTP protocol is functioning properly.
How to Use the SMTP Checker Tool?
Using our SMTP tester is quick and easy:
- Enter SMTP Server – e.g., smtp.gmail.com
- Choose SMTP Port – such as 25, 465, 587, or 2525 (By default SMTP Port 25)
- Select Security – choose Auto, SSL, or TLS
- Enter SMTP Username & Password
- Add From and To Email Addresses – to simulate a test email
- Click “Start Test” – and get real-time diagnostic results
Common Use Cases for SMTP Testing
Our SMTP test tool helps in:
- Troubleshooting email delivery issues
- Validating SMTP credentials and port configuration
- Ensuring your SMTP server is working correctly
Why Use Our SMTP Test Online?
Whether you’re setting up transactional email systems, accurate SMTP configuration is essential — and our SMTP check tool ensures just that.
- Reliable email delivery
- Real-time error diagnosis
- Easy setup with no technical complexity
FAQs
What is an SMTP checker?
An SMTP checker tool is an online utility that verifies whether your SMTP server settings are correctly configured and accessible. It tests SMTP server connectivity, port availability, and authentication to ensure your email sending works smoothly.
How do I use the SMTP test tool?
Enter your SMTP server, port, security type, username, and password. Add sender and receiver email addresses, then click "Start Test" to check connectivity.
Why should I test my SMTP server online?
Testing your SMTP server online helps you troubleshoot email sending problems, verify SMTP credentials, and check if your SMTP ports are open and working. This prevents email delivery failures and improves reliability.
Do I need to install anything?
No. It’s a fully browser-based SMTP tester — no installation or signup needed.
Is the SMTP test secure?
Yes, our SMTP test tool is secure and fully GDPR-compliant. We do not store, log, or share any SMTP credentials or email content submitted during testing. All data is processed securely in real-time to protect your privacy and ensure safe SMTP testing.