Exchange 2013 messages from internal user fall to Junk

Greetings,

I have Exchange 2013 CU23 and Outlook 2013.

An issue is in one user or maybe in two.. When user1 sends message to user2 mail message falls to Inbox folder and then moves to Junk folder. What I've checked:

1) Turned off junk filtering in OWA - no result

2) Turned off junk filtering in Outlook - no result

3) Turned off Kaspersky Add-on in Outlook - no result

4) Fully removed Kaspersky Endpoint Protection from PC - no result

5) Checked Inbox rules - no result



Will be happy for any suggestions!