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Your email account is most likely hacked if your friends got junk mail sent from your account. In this case you must change your email password. Actually, it is a good habit to change your email password periodically for security purpose.

An example of this kind of junk mail looks like this:

spam sent from your hacked mail account

For more information, you can check this out: http://www.richpasco.org/virus/hacked.html