Some users from a company which we migrated six months back to Office 365 started to complain that senders are getting two read receipt of the emails without them actually reading it. We found the issue was random and only some users had this problem not the whole organisation.
After some research we found out the users who are facing this issue are using POP to download the email to their mail client. And the sender is getting two Read receipts, One when the mail is downloaded and the other when it’s actually read by the user.
Fortunately the solution for the issue as quite simple, we have a switch available for CAS server to suppress the Read Receipt by pop.
In order to run the following commands, you need to connect to Azure online PowerShell, if you are not aware of the steps, feel free to follow How to Connect to Office 365 via PowerShell.
Run the following PowerShell commands for the problem POP3 users:
Set-CASMailbox popmbx -PopUseProtocolDefaults $false
Set-CASMailbox popmbx -PopSuppressReadReceipt $true
Hope this fixes the issue at hand, For dedicated support options refer our support plans Here
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