Growing spam problem

Gmail's spam filter has started to be broken. I've been getting more and more emails purporting to be from my cs.hmc.edu account, originally to that same account, then .forwarded to gmail. Gmail seems to actually believe the from address, even though the headers show it originating elsewhere, and sending it straight to my inbox.

Is this a sign that my CS account is compromised, and I need to worry, or do I just need to start making specific filters?

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