Your server specs look great except I'm not sure about the RAM, you might want to double the 4GB to 8 GB just to cut your use of swap files.
RAM on Zimbra is a bit deceptive. You really have a questionable system with less than 2GB even on a 1- or 2-user test environment, but then it scales a long way with no additional RAM requirements. I would think you'll find a bit of heavy swapping going on with 800 accounts on 4GB though due to some of the advanced Java that's going on with the Zimbra client.
That said the foundation of your server should not break a sweat based on what I have read from other users on this forum.
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Cheers,
Dan
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