In email, I always make my questions the last thing right before my signature.

• Phrase your questions unambiguously
• Bonus points for phrasing them with a binary response: “Do you want A or B?” or "Do you approve that we can move forward with the plan as stated here?"
• Only ask the questions you REALLY need an answer to. Every next question risks losing a answer you really need.
• Make self liquidating statements instead of questions “If you want a different path let me know. Unless I from you by the next Tuesday, I’m moving forward with what I described in this email”

If you write open ended or ambiguous questions you risk your audience having to take time to think about a response and they get distracted. Risky questions in this area are: “So what do you want to do here?” or “What do you think?”