Connection or authentication fails

  1. Confirm host, port, SSL/STARTTLS combination, username, and provider SMTP access.
  2. For Gmail, use a valid App Password where supported.
  3. Check the computer's internet connection, firewall, and network restrictions.
  4. Use Verification tools → SMTP tester → Test Now with the intended settings.

The code does not arrive

Read the success/failure message first. SMTP acceptance is not proof of inbox delivery. Check the recipient spelling, Spam/Junk, provider filtering, and any provider quota. Use an inbox you control and request a fresh code if the previous one expires.

Report safely

Record the version, operating system, host, port, security type, and redacted error. Never include a password, App Password, full license key, or API key. See support.