Free SMTP Test Tool – Fast & Reliable SMTP Email Tester Online

Free SMTP Test Tool

Use our free SMTP test tool to quickly check and verify your SMTP server settings. A powerful SMTP tester, checker, and email test tool to diagnose and fix email delivery issues in seconds.

SMTP Test Tool Configuration

Please enter the SMTP Host.
Please enter the port (usually 25, 465 or 587).
Select encryption type.
Enter a valid email address for SMTP Username.
Enter your SMTP password.
Enter the sender's name for the email.
Enter the test recipient's email.
Debugging provides detailed SMTP log output for troubleshooting.

What is an SMTP Test Tool?

An SMTP test tool is a web-based utility designed to help you verify and diagnose the configuration of your SMTP (Simple Mail Transfer Protocol) server. Whether you're launching a new email campaign, setting up transactional emails, or ensuring your hosting server is email-ready, this tool simplifies the testing process.

By simulating the process of sending an email, the tool checks your server’s ability to connect, authenticate, and transmit messages successfully. If you're a website owner, marketer, or IT professional, ensuring your SMTP configuration works properly is crucial for email deliverability.

Why Should You Use an SMTP Checker Tool?

Top Benefits:

How to Use Our SMTP Test Tool (Step-by-Step)

  1. Enter your SMTP server address (e.g., smtp.example.com).
  2. Specify the port number (usually 25, 465, or 587).
  3. Input your email address and password (if required for authentication).
  4. Choose whether to enable SSL or TLS encryption.
  5. Click on the "Send Test Email" button.
  6. View the result instantly – check for connection success, authentication status, and delivery success.

Who Can Use This SMTP Email Tester?

Our tool is perfect for:

Key Features of Our SMTP Server Test Tool

Common SMTP Errors You Can Detect

Fix issues like:

Why Proper SMTP Setup Matters for SEO and Branding

Poor email delivery doesn't just impact communication—it can also damage your brand reputation. When emails land in spam or fail to send, your users lose trust. For businesses that rely on transactional or marketing emails, this can mean lost revenue.

Using a free and fast SMTP testing tool helps you fix issues before your users face them. Plus, ensuring your email system is reliable improves your sender reputation, which ISPs and spam filters use to judge you.

Start Testing Your SMTP Now

Ready to test your mail server? Use our SMTP test tool below. Simply fill in your server details and click “Send Test Email.” If everything is configured correctly, you’ll receive an email in seconds.

SMTP Help & Troubleshooting

ProviderSMTP HostPortEncryption
Gmail smtp.gmail.com 587 / 465 TLS / SSL
Outlook smtp.office365.com 587 TLS
Yahoo smtp.mail.yahoo.com 465 SSL
Zoho smtp.zoho.com 465 / 587 SSL / TLS
iCloud smtp.mail.me.com 587 TLS
SendGrid smtp.sendgrid.net 587 TLS
Mailgun smtp.mailgun.org 587 TLS
Amazon SES email-smtp.us-east-1.amazonaws.com 587 / 465 TLS / SSL
ProtonMail Bridge 127.0.0.1 1025 / 1143 TLS

Always refer to your provider's docs. Some require special App Passwords or enabling less secure apps.

  • Ensure you have entered the correct SMTP host, port, username, and password.
  • If using Gmail, enable "App Passwords" and use that instead of your real password.
  • Some providers block SMTP by default. Enable SMTP access in their account/security settings if needed.
  • If you see authentication errors, try resetting your app-specific password.
  • If you see connection refused, check firewalls and that your host/server can access the SMTP server.
  • Check the Debug Output above for detailed error logs.
  • Search for error messages in PHPMailer's Troubleshooting Wiki.
  • Some web hosts prevent outbound SMTP entirely; check with your hosting provider if issues persist.
  • Always check the recipient's spam/junk folder for test emails.

This SMTP Email Tester uses PHP, Bootstrap 5, and PHPMailer to validate email sending ability.

  • Designed to be responsive for print or PDF export.
  • Your credentials are not saved after submission; always use on secure, private servers.
  • Source/PHPMailer Docs: PHPMailer on GitHub