Test your SMTP server, encryption, authentication and message delivery in one place.
Enter the same SMTP settings used by your website or app.
Each stage is shown separately so you can see exactly where a failure occurs.
Your results, SMTP capabilities and server conversation will appear here.
The tester connects directly to the SMTP server and verifies the connection one stage at a time. In connection mode it stops after authentication. In send mode it proceeds through sender, recipient and message acceptance using a fixed test message.
WordPress SMTP troubleshooting, transactional email services, Google Workspace, Microsoft 365, hosting mailboxes and custom SMTP servers.
Wrong port, TLS mismatch, invalid credentials, sender restrictions, relay denied errors, certificate problems and blocked outbound SMTP.
The interface never prints your SMTP password in the transcript. Production deployments should also disable request-body logging at the web server or reverse-proxy layer.