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We recently implemented an Ironport eMail and web filtering solution when we switched ISPs. &nbsp;It seems to be working very well but just in the last few days our Sender Based Reputation Score has shown &nbsp;up as being poor. &nbsp;So some sent emails have been rejected to vendors that I'm pretty sure are using the same IronPort solution which uses SBRS filtering. &nbsp;So my question is - how do I find out why our score has turned to &quot;poor&quot;. &nbsp;I've checked our virus application and I'm not seeing any issues with viruses (at least that it reports). &nbsp;Is there another way to check to see if a computer on our network may be sending out spam email? &nbsp; There is no spike or anything alarming on our Ironport machines. &nbsp;<br />
Could it be something else causing this? &nbsp;Any help would be very much appreciated. &nbsp;I want to stop this before it gets worse - especially if its something on our network causing this. &nbsp; Also - we are using a Cisco ASA firewall.<br />
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Thanks!<br />
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We recently implemented an Ironport eMail and web filtering solution when we switched ISPs.  It seems to be working very well but just in the last few days our Sender Based Reputation Score has shown  up as being poor.  So some sent emails have been rejected to vendors that I'm pretty sure are using the same IronPort solution which uses SBRS filtering.  So my question is - how do I find out why our score has turned to "poor".  I've checked our virus application and I'm not seeing any issues with viruses (at least that it reports).  Is there another way to check to see if a computer on our network may be sending out spam email?   There is no spike or anything alarming on our Ironport machines.  
Could it be something else causing this?  Any help would be very much appreciated.  I want to stop this before it gets worse - especially if its something on our network causing this.   Also - we are using a Cisco ASA firewall.

Thanks!



Sender Based Reputation Score

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).