SMTP Tester Online

Test SMTP server connections and email sending functionality with this free online tool

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About This Tool

This comprehensive SMTP tester allows you to verify email server configurations by testing SMTP connections in real-time. Enter your SMTP server details (host, port, encryption method), provide authentication credentials, and send a test email to validate your email server setup. The tool supports TLS/SSL encryption, tests authentication mechanisms, and provides detailed diagnostic information about connection success or failure. Perfect for developers, system administrators, and anyone configuring email clients or applications.

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How to Use

Enter SMTP server hostname (e.g., smtp.gmail.com)
Specify port number (common: 465, 587,
Select encryption method (TLS, SSL, or None)
Provide authentication username and password
Enter sender and recipient email addresses
Click 'Test SMTP Connection' to validate settings
View detailed results including connection status and any error messages

Frequently Asked Questions

Find Quick Answers

What is SMTP and why do I need to test it?

SMTP (Simple Mail Transfer Protocol) is the standard protocol for sending emails. Testing SMTP ensures your email server is properly configured and can send emails successfully.

What are common SMTP ports?

Common SMTP ports are 25 (unencrypted), 465 (SSL), and 587 (TLS). Modern email services typically use 587 with TLS or 465 with SSL.

Do you store my email credentials?

No, all credentials are processed in memory during the test and are not stored or logged. The tool only uses them to authenticate with your SMTP server.

Can I test Gmail or Office 365 SMTP?

Yes, you can test any SMTP server including Gmail (smtp.gmail.com), Outlook (smtp.office365.com), and custom email servers.

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