Testing SMTP

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So this is fairly basic but I realized I don’t have anything laying out the basic tools for testing SMTP posted.

Test with Telnet

  1. Determine the address of your SMTP server (unless you already know it or are testing local to the server)
    1. Open a command line (each line is a line return)
    2. type nslookup
      1. set type=mx
      2. domain.com
      3. Record the results
  2. Test with Telnet
    1. telnet <mail.domain.com> 25
      1. (this could be localhost or the output from the nslookup step)
      2. If you mistype past this point hit enter and try again don’t use backspace)
    2. ehlo mail.mydomain.com (you can replace ehlo with helo if your not using an exchange server)
    3. mail from: test@domain.com
    4. rcpt to: user@domain.com
    5. data
    6. Subject: This is a test
    7. Here you type your test message
    8. . (this is a period)
    9. quit

Web Based tools

Local Test tools

  • Pop3\SMTP mail client (outlook\express, thunderbird)
  • powershell
  • CMD\Telnet

Exchange 2007\2010 Powershell tools

  • Test-EdgeSynchronization (if using an edge subscription)
  • Test-Mailflow
  • Test-SmtpConnectivity

Supporting URLs

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