I have a situation where a supervisor needs to monitor a subordinate's email. The problem is that the supervisor needs to be able to check the messages from an iPhone, and we are trying not to have read receipts go back to the emails of people that send to the subordinate. I have been testing on an unrelated device with an unrelated account, and have gone as far as completely turning off read receipts for the Exchange account in my OWA settings- still returning read receipts, even after 72+ hours of being turned off. I'm not scared of changing Exchange settings, and I'm not scared of powershell. Is there a way to fix this without upgrading Exchange from 2013 to 2016? I know 2016 supports doing this... If there isn't a settings way to change it, can you recommend a transport rule that will accomplish this? I have full control of my Exchange environment. This is working properly on an android, so I think it has to be solved differently for the iPhone. I need the iPhone way to work.