DirectAdmin / Plesk Hosting - Enterprise Grade Spam Filtering A Plus

We have a variety of clients that we just put on various providers/platforms that we use for various reason. I've given up on HSphere though. I can see the versatility in this but I just don't have the time to invest learning the interface. What is a +++ though is HSphere platforms bundle in urchin--so for certain sites, we can turn urchin up on the fly.

Is there any hosts you guys recommend that have Enterprise grade email filtering. Part of the problem we have seen is just the level of spam filtering. Even with Pair, stuff was just coming through. For those with email in house -- great , as we just run the MX through Postini 1st and lock down SMTP on the FW side.

For some of our clients *with some minor hiccups* at times, we moved them to Google Apps. The spam filtering is just a +++ as much as I would like to get away from Google on the email. And yes, I am aware they own Postini now...

Back on to Webhosting.

I think we have found a couple of new guys to try
For nix based hosting, I'm planning to move some sites to Medialayer. Support or just various emails between them is very good !

For windows, we are debating. I have to reach out to Karl over at Steadfast and or Wiretree to inquire...but I'm leaning on a Plesk Windows Shared or VPS.

Usability is key on the CP and Cpanel/Plesk is just so much easier than Hsphere.

For the *email aspects* that's tied into any hosting provider, Mosso was interesting - BUT just looking at status.mosso.com was frighting.