This is from a work email, therefore I assume in a professional context:
Na dann haut rein ;-)
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Sign up to join this communityThis is a rather colloquial, but thoroughly positive phrase that can mean things like
but also
depending on preceding context.
This combination in the given neutral, friendly or professional setting will never be used for the other translation coming up a lot for "reinhauen", namely to indicate an encouragement to beat someone up.