Greyed out + perm selected "Copy sent message to folder"
My TB hangs when sending emails from outlook when it gets to the "Creating a copy to sent messages" option. However, obviously it's taken care of by the outlook server so I have no need for this. The solution is to stop it sending messages automatically... But when I try, the options are greyed out and cannot be unchecked. https://i.imgur.com/nD6eAeR.png
Any idea what options to change?
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using an addon to access an exchange server mail account perhaps?