Hardly an overhead
Hitting the AD for such information is hardly an overhead. If it is, they either have an elderly infrastructure or need to look at tackling spam off their network, rather than on this box once it's already within it.
Mirapoint has developed what it says is the first secure email gateway with a built-in directory and policy engine. According to the company, this increases security and lightens the load on the gateway because it no longer has to query the corporate directory server through the firewall for every incoming message. The …