Almost ALL blogs in the world get spammed, and yours is no exeption. You can either continously monitor it and delete spam posts, or set it to require admin approval before posts get public (this would, however, annoy the real visitors)

Email, Yes, theoretically it is possible. You can use a public key encryption to make it non readable, but that would complicate things for you and your for the others.

However, hackers are not interested in your emails, unless you are a company (and they want to profit by hacking your emails) or a government agency (in which case they do it even only for the fun) or similar. Why should they be interested in my emails ?

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