We are on exchange server 2013, all users are using OWA to access their emails. One user now is facing a problem. All emails he received from a specific internal email address went to junk mail directly. I thought the cause was bad "Inbox rules", but even I removed all "rules", the emails from that sender still go to junk mail....
This only happens to one user, no one else has the same issue. I checked all settings on the server for his account and all settings inside OWA under his login, there is nothing else to setup for incoming rules ....
I tested with some other accounts to receive emails from that sender with and without few rules, they all working well.
Where should I start troubleshooting? Or is there a way to re-set the account settings to default?