Read Receipt near instant read reply when not read, then actual receipt when read.
Global read receipt is off so when I send an email with a manual read receipt request, soon after sending I get the following response when the message has not been opened or read.
"Your message
To: John Doe Subject: Pat Sent: Monday, April 13, 2015 12:34:11 PM (UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi
was read on Monday, April 13, 2015 12:36:09 PM (UTC+08:00) Beijing, Chongqing, Hong Kong, Urumqi."
Later when the message has actually been read I get the correct read receipt.
Is this an automatic server response or are my emails been sent to multiple places, bug? Virus?
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My guess is your getting an automatic response from the receiving server and then one from the email client when the message is read.
You could also be getting a receipt from their phone and desktop mail clients.