IP Ban By Message Lab, Suspect of Hosting SPAM Mail Server

I got a big problem. Our company emails are outsource to 3rd party that is providing us POP3 accounts. Recently, Internet IP address is listed in 1 of the hundreds Public SPAM Database and some of the email got bounce back with Mail failure indicating the email send my company staff were spam.

Despite I delisted my company IP from it, those email is still bounce by Message Labs. Is there anyway to prevent internet IP being listed as SPAM IP? My company always got alot of outside people coming and going out using our internet to send out email. Is there any software or hardware to monitor such issue and prevent them from happening? I'm grateful for any valuable help or suggestion, you expert can provide.  
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anekyAsked:
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flscottCommented:
Is this happening during bulk emails? If so, try cutting down the number of BCC recepients of emails.
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anekyAuthor Commented:
well we don't sent out BCC that much. I would just like to know if there is way by hardware or software to monitor any bot or desktop/laptop infected with virus to sent out spam mail resulting my office ip got blacklisted.
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Keith AlabasterEnterprise ArchitectCommented:
I know this is an old question now but something as simple as etherea/wireshark will monitor the data packets and identify if something is flooding.
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