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Free SMTP Test Tool – Online Email Server Tester

SMTP Test Tool helps you quickly verify and diagnose your email server settings online from your browser.

SMTP Server Configuration

Not connected

Connection Log

// SMTP connection log will appear here

Test Email

Email Log

// Email sending log will appear here

How to Use the SMTP Test Tool

1. SMTP Server Configuration

Enter your SMTP server details to test the connection:

  • SMTP Server: Your mail server address (e.g., smtp.gmail.com, smtp.office365.com)
  • Port: Typically 587 for STARTTLS, 465 for SSL/TLS, or 25 for unencrypted
  • Username: Your full email address
  • Password: Your email password or app-specific password
  • Security: Encryption method used by your provider

2. Testing Connection

Click the "Test Connection" button to verify your SMTP server settings. The tool will attempt to establish a connection with your mail server and display the results in the connection log.

3. Sending Test Emails

After successfully connecting to your SMTP server, you can send test emails to verify that everything is working correctly:

  • Enter the sender and recipient email addresses
  • Add a subject and message for your test email
  • Choose whether to send as HTML or plain text
  • Click "Send Test Email" to send your message

4. Common SMTP Settings

Provider Server Port Security
Gmail smtp.gmail.com 587 STARTTLS
Outlook/Office365 smtp.office365.com 587 STARTTLS
Yahoo smtp.mail.yahoo.com 465 SSL/TLS
iCloud smtp.mail.me.com 587 STARTTLS

5. Troubleshooting

If you're having issues connecting to your SMTP server, check the following:

  • Verify your username and password are correct
  • Ensure you're using the correct port and security settings
  • Check if your email provider requires app-specific passwords
  • Verify that your firewall isn't blocking the connection
  • Check if your email provider allows SMTP access (some require enabling it first)