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Kevin StaleyFlag for United States of America

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Outlook 2016 getting two read receipts from single recipient

Our company is on Office 365 (and so their Exchange server) and all users have Outlook 2016 installed. I recently heard from an employee who claimed that when an email is sent to most people within the company and a read receipt is requested, two read confirmations are returned when the recipient only acknowledged the prompt to confirm one time.

I performed a few tests. I had the employee send a test email to me. I clicked to confirm and two read replies were returned. I then sent an email to the employee and requested a read receipt, only one was returned. The same employee sent an email to someone outside of our company and only one read receipt returned. Also, when a test email was sent to one other fellow employee only one receipt was returned, however, test emails to three other employees resulted in two read receipts per recipient.

Any suggestions of other testing procedures that might isolate the cause would be appreciated, or any suggestions on configuration changes to make in either Outlook or Exchange to resolve this issue would be even more appreciated.
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Vasil Michev (MVP)
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For starters, run a Message trace to see if some sort of forwarding is triggered. To exclude issues caused by Outlook add-ins, test from OWA as well.
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Thanks Vasil! I did run a message trace, and other than seeing duplicate emails for those recipients who generated two, they did not differ from the employee whose read receipt only generated one. I will ask the employee to test from OWA too. Good suggestions, thanks!
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Satish Auti
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The message trace details (Get-MessageTraceDetail) should tell you if the message was forwarded or a transport rule acted on it, etc. The headers should also indicate this. But what Satish mentions above seems like a known issue, so definitely check that part as well.
I had the employee send me an email with a read receipt using OWA and they only received one receipt. Does that not rule out an Outlook add-in since it would have to be an add-in in my Outlook (their email from Outlook to me returned two read receipts)?
Doesnt rule out issue with *his* Outlook, either and add-in or something else. It's simple to test if you run Outlook in safe mode on his machine (either hold the CTRL key when launching it or type 'Outlook /safe' in the run box).
If it was in their Outlook it seems it would happen to every employee in our company that is sent an email from them with a read receipt, not so?
I opened my Outlook in safe mode and only one read receipt was delivered. Then, I opened Outlook as usual and in response to a new test email it sent two read receipts confirming the suggestion that it is an add-in. Now to figure out which one. It may be early next week before I update this post with my discovery of the add-in that reads too. Thanks for the suggestions!
After a bit more testing it seems our anti-virus Outlook add-in (Kaspersky) is the culprit. It was high on my possible suspect list, so not surprised. Now to get up with Kaspersky to find out if there is a remedy for this behavior.
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