When you use DidTheyReadIt, e-mails that you send are automatically and invisibly tracked. The instant the recipient opens your message, DidTheyReadIt automatically notifies you. DidTheyReadIt is much more powerful from standard "return receipts." It differs from standard read-receipts because it works regardless of the e-mail program being used by the recipient. Standard read-receipts don't work if someone views your e-mail in web-based e-mail programs like Hotmail or Yahoo!, and some desktop e-mail programs can't process them either.
