Testing SMTP Services (Relay) Quick Reference

To test the SMTP service, follow these steps:
  1. Open a Command Prompt.
  2. Telnet to port 25 of the host you intend to test (e.g. telnet computername.yourdomain.com 25). The output resembles the following:

    220 computername.yourdomain.com ESMTP Server (Microsoft Exchange Internet Mail Service 5.5.2651.58) ready
     
  3. Type helo me and press ENTER. The output resembles the following:

    250 OK
  4. Type mail from:email@domain.com and press ENTER. The output resembles the following:

    250 OK - mail from <email@domain.com>
  5. Type rcpt to:youremail@yourdomain.com and press ENTER. The output resembles the following:

    250 OK - Recipient <youremail@yourdomain.com>
  6. Type Data and press ENTER. The output resembles the following:

    354 Send data.  End with CRLF.CRLF
  7. Type Subject:This is a test and press ENTER twice.
  8. Type Testing and press ENTER.
  9. Press ENTER, type a period (.), and press ENTER. The output resembles the following:

    250 OK
  10. Type quit and press ENTER. The output resembles the following:

    221 Closing Port / Mail queued for delivery