Professional SMTP Test Tool

Test any SMTP server configuration with our advanced diagnostic tool. Perfect for developers, email marketers, and IT professionals.

No Login Required Secure Testing Mobile Friendly

SMTP Configuration Test

Enter your SMTP server details below to test the connection and send a test email.

Enter your SMTP server hostname or IP address
Please provide a valid SMTP host.
Common ports: 25, 587, 465, 2525
Please provide a valid port number (1-65535).
Usually your email address
Please provide a valid email address.
For Gmail, use App Password instead of regular password
Please provide your SMTP password.
TLS recommended for port 587, SSL for port 465
Display name for the sender
Email address to receive the test message
Please provide a valid recipient email address.

Common SMTP Settings

Host: smtp.gmail.com

Port: 587 (TLS) or 465 (SSL)

Security: TLS/SSL

Note: Use App Password for authentication

Host: smtp-mail.outlook.com

Port: 587

Security: TLS

Host: smtp.sendgrid.net

Port: 587 or 465

Username: apikey

Password: Your API Key

Host: email-smtp.us-east-1.amazonaws.com

Port: 587 or 465

Security: TLS/SSL

Replace region as needed

Why Choose Our SMTP Test Tool?

Professional-grade email testing with comprehensive diagnostics

Instant Testing

Quick and reliable SMTP server testing with real-time results and detailed diagnostics.

Secure & Private

Your credentials are processed securely and never stored on our servers.

Mobile Friendly

Responsive design that works perfectly on desktop, tablet, and mobile devices.

Multiple Providers

Test Gmail, Outlook, SendGrid, Mailgun, Amazon SES, and any custom SMTP server.

Debug Mode

Detailed SMTP conversation logs help identify and resolve configuration issues quickly.

No Registration

Start testing immediately - no account creation or login required.

Troubleshooting Tips

Common Issues

  • Authentication Failed: Check username/password and enable "Less secure app access" for Gmail
  • Connection Timeout: Verify host and port, check firewall settings
  • TLS/SSL Errors: Try different encryption settings or ports
  • Gmail Issues: Use App Password instead of regular password

Best Practices

  • Always use TLS/SSL encryption for security
  • Use dedicated SMTP services for production
  • Test with a real recipient email address
  • Keep your SMTP credentials secure

Frequently Asked Questions

Get answers to common questions about SMTP testing

Yes, our SMTP test tool is completely free to use. There are no hidden charges, registration requirements, or usage limits. It's designed to help developers and email marketers test their SMTP configurations quickly and easily.

No, we do not store any of your SMTP credentials or email data. All testing is performed in real-time and your sensitive information is processed securely without being saved to our servers.

Our tool supports all major SMTP providers including Gmail, Outlook/Hotmail, SendGrid, Mailgun, Amazon SES, and any custom SMTP server. We provide pre-configured settings for popular providers to make testing easier.

The SMTP log displays the complete conversation between our tool and your SMTP server, including connection attempts, authentication steps, and any error messages. This detailed information helps diagnose configuration issues.

Gmail requires App Passwords for third-party applications. Generate an App Password in your Google Account settings and use it instead of your regular password. Also ensure 2-factor authentication is enabled on your account.

Yes, this tool is suitable for testing production SMTP configurations. However, we recommend testing with non-production credentials first and ensuring your SMTP server can handle the test connections.