Seems like the world is being particularly inundated with spam the last month or so. Especially, all of that darn picture attachment junk. Our company is a media/printing outlet and I just cant block these sorts of attachments, the text is too random, filters are not getting it etc. Probably the same problems alot of people are having. Anyway, I am seeing alot of traffic hitting our exchange server for bad addresses and I do not have the capability at this time of doing an LDAP lookup before the exchange server. What can I do to stop exchange from sending bounces on this type of mail? This will allow me to virtually cut in half the server load created by this type of junk until I can do something better before email hits the server. Input? Any other ideas? I just cannot find any configuration options on exchange on how I can set up the way it treats error codes and return email's to senders.
For background this is our current email flow:
World -> Postini -> external mail filter (linux postfix) -> internal mail gateway (SAV for gateways, ver 9. I have a 10 licnese but have not upgraded yet) -> Exchange with SAV 9 for exchange installed (again, have 10 license not installed yet). Even with all of these stops along the way an inordinante amount of spam is getting through and it's really taxing the hardware.
Thanks in advance!