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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An automobile enthusiast at heart and computer geek by profession, started my Career with MS in 2005.Left Jobs and started Pledge Technologies (the parent company to Grishbi) back in 2009.We have been providing IT consulting to various Small and Medium businesses across US and UK since then.Our company specialises in Microsoft Server technologies like AD, Exchange, the rest and with numerous Office 365 migrations under our belt, we quite an expert with that too. Whatever we learn in our day to day life, we share it back on Grishbi as a Thank for all the love and support our customers have given us.
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