2003 SBS + exchange notify mailbox full ?

Got a client with 2003 SBS + exchange and one of the station gets about once a day a mail message which says that the capacity of the mailbox is near it's limits (around 180M out of 200) and it should be cleaned or something like that.
There are 2 accounts on this machine,one is a normal ISP mailbox and the other one is internal.
I looked at the server and the mailbox is set to default values....How do i empty mailbox on the server ? didn't managed to see the actual mailbox, only the account settings.
Thank you

IS the mail message coming from the isp account or the exchange

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Originally Posted by Radical Dreamer

IS the mail message coming from the isp account or the exchange

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It seems to come from the exchange.
Even that the exchange is english based, the message is in hebrew.
I think the computer translates this generic messege into Os translated message