Test whether a mail server is reachable and responding on standard SMTP ports (25, 465, 587). Verify that mail server configurations are working before and after changes.
Verifying a new mail server is reachable, troubleshooting email delivery failures, checking if an ISP is blocking port 25, or validating MX record changes.
Test SMTP server connectivity and verify email server configuration. Check if your mail server accepts connections on common SMTP ports (25, 465, 587).