There is a thread about “ask a rabbi” websites on Stack Exchange (Mi Yodea), which lists various sites. The only well-known posek I know of who will quickly answer a question on any topic (through text or email) is the chardali (charedi-dati-leumi) posek Rav Shlomo Aviner. But like Charlie says, you should ideally find a good rabbi from your local community.
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