While Composing an email, put a check next to "Return receipt" to request the sender to send a receipt back to you when they open your message.

Next to return receipt, you can set the priority to Normal, Low, or High.

When opening the email the sender will get a pop up similar to the screenshot above, depending on their email software. The exclamation point circled above indicates it was sent as a high priority message.

Here is what a return receipt looks like when it is sent back to you.
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