I'm amazed at some of the other uses they mention on the "About Us" page:
"A student applying for jobs who wants to know if employers are reading her e-mails." This will probably get your resume thrown in the trash if the potential employer realizes you're doing it.
"A business owner who had made an offer to sell a piece of property. He used DidTheyReadIt to track how often the recipient had read his message, and how long the message had been read for. DidTheyReadIt also showed that the message had been forwarded to a law firm." That last part might be grounds for a lawsuit, and the whole thing smacks of industrial espionage and unfair trade practices.
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