Thanks to all who replied thus far, to answer a few questions:

* our IMAP implementation is dovecot
* approx. 25K mail boxes but they will not all be using this, most won't

And a follow-up question:

* anybody familiar with zerospam.ca ?

Will summarize thread.

- mark


Mark Jeftovic wrote:
> Hi, we're looking for recommendations for an antispam service we can
> layer in front of our hosted IMAP offering.
> 
> 
> We've tried a few services so far and our testing has found serious
> deficiencies.
> 
> Requirements:
> 
> * hosted or virtual appliance
> * quarantine with management (auto-purge options)
> * prefer content based filtering over RBLs, having serious
> false-positive issues with RBLs - bonus for being able to enable/disable
> individual RBL's by domain/user
> * tag-only mode
> * user defined white-lists
> * anti-virus filters
> * API
> * white-labelling a plus but not a requirement
> 
> Any feedback, experiences recommendations would be appreciated.
> 
> - mark
> 

-- 
Mark Jeftovic <mar...@easydns.com>
Founder & CEO, easyDNS Technologies Inc.
http://www.easyDNS.com



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