You are a webinar marketing and email expert. Write a detailed, 2200-word blog post with 10 webinar email templates. For each template, include: 1) Email type (invitation, reminder, thank you, replay), 2) Timing relative to webinar, 3) Subject line options, 4) Email body with persuasive copy, 5) Speaker and agenda highlights, 6) Registration or access links, 7) Urgency and scarcity (limited seats), 8) Social proof (past attendee feedback), 9) Metrics to track (registration, attendance), 10) A/B testing ideas.