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I've just had a discussion with a colleague about email read receipts and after a little Google research I haven't found any solid information on them.
As a recipient I open my email in either Mozilla Thunderbird or on my iPhone. My email is setup from a company managed G-mail account.
My question is how do I know that someone has requested a read receipt?
Will Thunderbird and my iPhone both send it back automatically, or will they request my approval?
How can I disable this feature?