Rediff.com India — my password has been detected by some others.

Address:

8-1-297/2/E/11,12 FLAT NO 410,SUPER FALCON APART, Hyderabad, Telangana, 500008

I got few mails in my junk saying that they know my password for my mail and he actually sent me my password which is correct only. He said that he got few videos and contacts of mine and asked for money.
Date of mail:[protected], 2:13 am.
Seen in junk files.
From :[protected]@9860.com.

Please kindly see the email and solve the issue because the person knows my correct password.