If any one of you is using Gmail as your email account (in addition to Yahoo etc), then please read this true story about a security hole in Gmail which may lead to some very serious problem if you ever send/receive any password related information through Gmail.
The website of a guy was hijacked by a hacker who controlled his Gmail account. Though it appears that this security hole is fixed by Google now, you never knows what can happen
Read here :
WARNING: Google’s GMail security failure leaves my business sabotaged
How he got his domain back : Read here
Read about : Gmail Hack technique