My exchange server is under spam and phishing attack. We have a firewall unit but that does not support spam filtering.
Since 2 weeks thousands of emails are coming in and out from the exchange server which is not legitimate. I am using Exchange 2003 Enterprise server with SP2 and IMF turned on with settings 7/6.
Can you somebody tells me few tips that how can I protect my server from these attacks. All these emails are eating up all my Internet bandwidth and all users are getting emails undelivered which they never sent.
If you need any other information let me know.