When i goto General Email Options and choose 'Yes' on "Hide Sent Messages", my sent messages still show up in my Inbox.
When i go back to the option it shows marked 'No'.

any thoughts?

These threads turned up in a "search" and may be of use to you.

Hide Sent/Hide Filled not working

Hide Sent Messages Not working

thanks devnull.
Unfortunately, i'd seen those posts and didn't really find a solution...