Act as an experienced email marketing strategist with expertise in AI automation. Design a step-by-step guide on how to use AI to automate email responses for [BUSINESS TYPE], ensuring [KEY GOAL, e.g., customer satisfaction, lead conversion]. Include tools like [AI PLATFORM, e.g., ChatGPT, HubSpot] and best practices for personalization, timing, and follow-ups. Address common challenges like [SPECIFIC ISSUE, e.g., spam filters, tone consistency] and provide actionable solutions. The guide should be clear, concise, and tailored for [TARGET AUDIENCE, e.g., small business owners, marketing teams].