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SMTP Tester

Verify SMTP credentials and send a real test email from any mail server

SMTP server
Pick a provider to autofill the connection settings, or choose Custom for any SMTP host. Nothing is stored — credentials are used only for this one connection.

Credentials are sent over HTTPS to our server, used for a single SMTP connection, and never logged or saved.

Test message
The test email is sent to a single recipient — usually your own inbox — so you can confirm it actually arrives.

Sending a test email requires a free account. Verifying a connection works without one.

How it works:This tool opens a real SMTP connection from our server to the host you specify, using the exact credentials and encryption you enter — pure SMTP, no provider APIs. “Verify connection only” runs the handshake and login without sending mail; “Send test email” delivers a message so you can confirm end-to-end delivery.

About this tool

Use it to

  • Confirm SMTP host, port, username, and password before wiring them into an app
  • Send a real test email to verify end-to-end that messages reach the inbox
  • Debug authentication and connection errors straight from the raw SMTP response
  • Compare STARTTLS (587) and implicit TLS (465) when a provider will not connect
Verify new credentials
Pick your provider to autofill the host and port, paste your username and API key, then use "Verify connection only" to confirm login works before sending anything.
Send yourself a test
Enter a verified From address and your own inbox as the recipient, then send a test email to confirm messages actually arrive — check the spam folder too.

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