The best way to respond to a Houzzer individually is via their account on Houzz, using your inbox - http://www.houzz.com.au/messages
If they provide you their email address, you can then use that to respond to them directly instead.
If a user has blocked their account from receiving messages, the only way to contact them is via a discussion where they are also a commenter (or if they posted the thread).
Luke Buckle
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