A delivery receipt is a message from the mailserver when the message has
arrived the mailbox of the recipient. The Read receipt is a message from the
recipient to notify you that the message has been read.
The delivery receipt needs to be supported by the mailserver of the
recipient. A Read receipt needs to be supported by the e-mail client of the
recipient and requires user interaction of the recipient.
To be pedantic, it's actually a notification that the message has been
_opened_. You can't actually check if the message has been _read_ or, more
importantly, _understood_.
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