Am I sending junk mail to my friends?

[Danielle]

A friend on facebook contacted me and said that she thought she was getting junk mail from my hotmail account. It had my name in the subject line, but the email address started with "la" and then the rest was replaced with asterisks. I've never had an email address that started with "la" and haven't opened up any suspicious emails lately that could infect my computer. Does anyone know how I can look into this and fix it if it is being sent from my account?