Act as a seasoned sales strategist with 10+ years of experience in cold outreach. Teach me how to strategically use quotes in cold emails to increase response rates by [X]% for [INDUSTRY] professionals targeting [JOB TITLE]. Cover: 1. When to use quotes (e.g., social proof vs. thought leadership) 2. Ideal quote length and formatting for [EMAIL PLATFORM] 3. How to attribute quotes without sounding spammy 4. Three high-converting examples blending quotes with [PAIN POINT] hooks 5. Common mistakes that trigger spam filters Include a before/after breakdown of a real [COMPETITOR] email improved with quotes. Provide A/B test frameworks for measuring quote effectiveness in [CRM SYSTEM].