[OT] Anti-spam service?

[Francisco Reyes]

Tried Postini and the fact they are in business is a testament of the 
patient people have. Their interface has to be one of the worst I have seen 
in a while.

Sure I could figure it out, but the intent is to find a service one of my 
clients can use directly without having to call me.

Anyone happily using any service that a non techie user could manage?
Service must have a quarantine area where users can go check spam that got 
trapped.

Thanks for any recommendations.