PROVE it by tell *us* how YOU know that to be happening. Don't expect
focused and detailed responses based on a vague question.
Outlook WHICH VERSION?
Windows WHICH VERSION?
Anti-virus software?
Type of e-mail account?
Error message?
Whatever else makes you think Outlook is sending something.
Was Outlook ever involved or even your host? Maybe you have forwarding
enabled up on the server (so use the webmail interface to your account
to go check the server-side options).