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I need an antispam for cPanel and Zimbra
It may be a paid solution
System Administrator at Staybox. Host your services in Brazil ~ staybox.com.br
I'm use VPS from RamNode
I'm use Reseller Hosting from BuyShared
Zimbra already contains a fairly powerful antispam solution.
If it's not sufficient, you might want to use an external SMTP relay with inbuilt antispam, something like MailChannels or MailCheap.
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SpamAssassin is great in CPanel. I also have Mailchannels as well mainly for deliverability, but they also include spam filtering and alerts.