Test your email server configuration, delivery, and authentication in seconds.
Start Testing
Test connectivity to your SMTP server and verify proper configuration.
Send test emails to verify successful delivery and inbox placement.
Verify your SMTP username and password credentials work correctly.
Check secure connection options for your email server.
Examine email headers for proper formatting and configuration.
Basic evaluation of potential spam triggers in your email content.
Measure server response time to identify performance issues.
Verify email format and deliverability before sending.
Enter your SMTP server details below to test your email configuration
Waiting for test to run...
Provide your SMTP server address, port, credentials, and security settings.
Our tool attempts to connect to your SMTP server to validate connectivity.
We securely test your login credentials with the SMTP server.
Send a test message to confirm the full email delivery process works.
Examine detailed test results to identify and fix any configuration issues.
Email delivery is critical for businesses and applications. Testing your SMTP configuration helps:
SMTP (Simple Mail Transfer Protocol) is the standard protocol for sending emails across the Internet. It's used to send emails from one server to another or from an email client to a mail server.
Yes, this tool processes all testing client-side in your browser. Your email credentials are never stored on our servers or transmitted to us. We recommend using test accounts rather than production credentials whenever possible.
Common SMTP ports include:
- Port 25: Standard SMTP (often blocked by ISPs)
- Port 465: SMTP with SSL encryption
- Port 587: SMTP with TLS encryption (recommended)
- Port 2525: Alternative SMTP port
This error typically means your SMTP server requires a username and password, but either they weren't provided or they're incorrect. Double-check your credentials and make sure your account has permission to send emails.
Both TLS (Transport Layer Security) and SSL (Secure Sockets Layer) are encryption protocols that secure data transmission. TLS is the successor to SSL and provides stronger security. Most modern email servers use TLS on port 587.
No, this tool is designed for testing basic SMTP configuration and single email delivery. It's not intended for bulk email testing or sending marketing campaigns. For bulk testing, consider using specialized email marketing platforms.
Test your SMTP configuration now to ensure reliable email delivery for your business or application.
Start Testing Now
Learn everything you need to know about setting up and configuring SMTP servers for reliable email delivery.
Read More
Discover proven strategies to improve your email deliverability and ensure your messages reach the inbox.
Read More
Solutions for common email delivery problems including authentication failures, bounces, and spam filtering.
Read More