Responding to email questions

I received an email with a question related to a post I made on a thread, but there was no link back to the thread.  I'm not really sure how to respond the question.  I previously responded to question from a thread post via email but it included my organization's entire signature with information that should remain private.  Are private messages a feature of the discussions and if so I can I respond without including my personal work email information?  

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