Is SUPost being hacked? Someone is using it for email attacking

I keep receiving MORE THAN TEN JUNK EMAILS EVERY DAY with no sender email address in replying to the following post which I DELETED MORE THAN A MONTH AGO AND TRIED TO DELETE AGAIN EVERYDAY TILL NOW.

PolkAudio Hi-Fi speakers $60 Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM

I copy a few emails I received just now to show how they look like. I wrote to contactcontact@supost.com before to report this problem and seek for help but received no reply till now. Could anyone tell me how to get rid of this annoying problem? Thanks in advance! Also, if you have similar problem now and know that someone in the SUPost team is already working on this please let me know.

Following are the junk emails I received within the last two hours!

Algunas veces han sido denunciadas, Pero casi siempre shedd tribunales confirman cual la Industria de that no Moda necesita mas proteccin,
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PolkAudio Hi-Fi speakers $60  Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM
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PolkAudio Hi-Fi speakers $60 Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM

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PolkAudio Hi-Fi speakers $60  Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM
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PolkAudio Hi-Fi speakers $60  Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM
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PolkAudio Hi-Fi speakers $60  Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM
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PolkAudio Hi-Fi speakers $60  Monster ZSeries Hi-End speaker cable $60 - Posted: Sat Jul 12, 01:23 AM
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