Welcome to the forums.
That hardware specification would be more than adequate. Is this for the Network Edition or Open Source edition? If it's for NE then we do not provide support for CentOS, it would have to be RHEL. For the OSS version CentOS is fine.
For the A/S-A/V it would depend what your current soluton doe and how it's implemented. If it processes the mail and forwards it to Zimbra then that would work, you could disable (if you wanted) our A/S-A/V.
I'm not sure about the multi-drop pop mail collection. Is there any reason you don't want the mail delivered directly to your server?
yes, you can use zimbra internally and you can limit the sending of external email for some users. Some f these would be via postfix modifications.
How is your system set-up at the moment?
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Regards
Bill
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