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Without an NDR (Non Delivery Report) figuring this out will be extremely difficult.

You can however rule out some obvious causes:

  • Typo or spelling mistake on the email address.
    You would be surprised to hear that this is the no.1 reason for email not getting delivered!
  • Blacklisted
    Check your domain for being Blacklisted
  • Server error
    If you have your own mail server – is it connecting to the Internet and receiving email?
  • Account error
    Is the email account working?
  • Can your server receive emails?
    Microsoft created a tool for checking this: Microsoft Remote Connectivity Analyser

You’ll need an NDR to get any further than this…