How to check if the person you emailed receive or open the email?

Sorry, but there's no reliable way. Not even on Windows!

Matt

There is a person I send emails to who doesn't respond and always says "I never got your email" or "I didn't see your email until it was too late". That is, however, unless the email I send is something along the lines of "I have your check if you can come over right now to pick it up". Then I get an immediate response.

So, end each email with "I have a check for you. Email me back so we can meet".

Brilliant!

Matt