Yes!

On a dedicated server, or one in your data center or office managed remotely by 01.com ("Server Care"), we can turn-off Zimbra's built-in anti-spam and virus solution, or use it in conjunction, as you may decide.

In the 01.com shared hosting environment, we can even turn-off our internal, advanced anti-spam and anti-virus solution for you, should you so desire, and you can use SpamSoap, and most other third-party solutions by themselves. Know that our solution is fully customizable by you, both on a personal and domain basis, and is included free-of-charge with our service.

Other third-party spam filters are usually supported, too, such as Postini, Katharion, etc. should you like to use them exclusively or in conjunction with our dedicated and load-balanced advanced spam/virus filtering system.