[hrbrmstr]

I've worked and consulted in over 15 very large enterprises. While it may not constitute a survey of the entire Fortune 500+, I've come into contact with enough business & IT professionals to know that is is - in fact - not a well-received feature. It's used by either underperforming folks as a CYA measure or other folks who have side-swiped by self-serving individuals.

There is no legitimate use or business-case for a read-receipt service, especially ones that use the same techniques as malware writers.

I fully support your third-party "who responded to me?" reporting & reminder tool, as I can see that being incredibly useful - especially to those who are not adept at scripting and/or using mailer APIs.

[aberkowitz]

I have never worked in a large enterprise, or a Fortune 500 company, but email receipts are a necessary evil. Certain industries rely on time sensitive work to be done base upon an email. If this doesn't happen, business is lost and contracts fall through.

While I strongly dislike Outlook, their opt-in read-receipts are the best implementation that I know of as far as privacy and ease-of-use are concerned.