Email security - gateway

["WALI" <hkhasgiwale () gmail com>]

Hi guys

I am looking for something to act as an all in one gateway for my 
incoming/outgoing mails. Have been using a product for a combined 
AntiSpam/Antivirus but it's not performing well. Not a core AntiSpam 
company. is though good as catching viruses at the gateway level.

Someone suggests that we go for two different products and chain them 
together so incoming mails pass through AntiSpam and then another Antivirus 
before they land in our Exchange server.

Any suggestions, on edge mail security design and products?