I use ReadNotify.com, and no, the recipient does not know that you are using it. It's completely legal. ReadNotify can tell you when an email was delivered, when/if it was opened and when/if it was deleted. It works with gmail. It's about $5/month for the basic service, and it's a bit wonky sometimes in that you have to go to the ReadNotify site to check the status of your emails, they don't always deliver a receipt. But it's a good way to prove that a) you sent a message; and b) your ex (or someone using his/her email account) opened the message.
Originally posted by dad2bandm
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