SMTPDiag – troubleshooting email issues


SMTPDiag is a handy tool for tracking down SMTP based issues.  I recently used in a newsgroup posting that was helpful along with a few other times at   It is definitely one of those tools worth having if you have to troubleshoot email issues. 

  • Nice short article how to use SMTPDiag.
  • Download SMTPDiag.   It doesn't require an install so it can be copied to any machine.

Bernard Cheah posting is helpful also.