SMTP Server Tester

Test your SMTP server configuration and send test emails securely

e.g., smtp.gmail.com, smtp.office365.com

Privacy & Security

All tests are performed in real-time. No credentials or email data are stored on our servers.

Common SMTP Ports

  • Port 25: Default SMTP port (often blocked by ISPs)
  • Port 587: Recommended for SMTP submission (TLS)
  • Port 465: SMTP over SSL (deprecated but still used)
  • Port 2525: Alternative port (non-standard)