williamhathaway.com

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* To view only unread mail, use a search filter of is:unread (there are also a bunch of other tags you can use as well like is:replied or is:forwarded)

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* To search only against a specific header from the basic search box, prepend the header name with a colon: from:william or from:will*

You can see the full list of search tips from the Zimbra Wiki.