I suspect Trojan in my system

On my computer installed Bitdefender Total Security. Recently New discovery, I never check the email section "SENT", checked today May 17 and found two empty emails sent to two different addresses which unknown to me and are not in my addresses lists, it was sent by the computer itself on April 17th and 18th. Despite the fact that I scanned computer at the end of April and the second time in May, the result showed that the system is clean. Scanned because the computer started behaving strangely but I didn't know about the emails sent. Now I have no doubt why my computer began to behave strangely and slowly, I have a Trojan from which your famous defense could not protect.

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