You can see what the tinyurl redirect destination URL is (value of Location response header) without also requesting that URL. Not with a typical browser config

You can see what the tinyurl redirect destination URL is (value of Location response header) without also requesting that URL. Not with a typical browser configuration, but with curl or some hosted solution delivering this functionality. Of course, if the email actually has a unique URL per recipient, then doing this gives away the fact that you interacted with the email.