I have set "Settings -> Mail -> Read Receipts: never" in my Outlook Web App (Exchange 2010SP3UR8+) settings. However I noticed that after emptying my Junk folder there was a bounce for a "Subject: Not read: xxx" mail.
So it looks like OWA has - without asking - sent non-read receipts for mails in the cleaned junk folder. Something I clearly not want. Is there a way to turn this off (for my client or on the exchange server).
In the past I had a mail gateway to the internet which removed all those disposition request headers, but that is no longer in place.