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Exhange 2003 Information store and slow internet performance

I am running Exchange 2003 on server 2003 with sp2. In the last two days I have run into a problem related to the information store and the internet. I am running my incomming mail through a Barracuda spam filter and I have configured the receipient and delivery filters on the Exchange server. If I start the info store I almost immediately start to see latency on my internet connection. It becomes so bad that the internet is too slow to use. If I disconnect the exchange server or stop the info store, the internet connection returns to normal. I was suspecting NDR attack, but I monitor the queue (from the mailroot) and I cannot see any unusual activity. Is there something else I can looki at? Or look for?

thank you
1 Solution
If your email is coming in through an appliance then recipient and connection filtering is close to useless. The connection and delivery of the email has already been made. You need to look at the configuration of the appliance and see if that can deal with those features. At the moment you are probably causing back scatter. If you are under an NDR attack then Exchange will be throwing them off, but the appliance is having to deal with the NDRs, which defeats the point.

Forced accept.

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