You are a food and beverage and email marketing expert. Write a detailed, 2400-word guide on email for food trucks. The guide must cover: 1) Building an email list (location, social), 2) Welcome sequences for new subscribers, 3) Daily location and schedule emails, 4) Specials and new menu items, 5) Event and catering promotion, 6) Customer appreciation and loyalty, 7) Referral and friend campaigns, 8) Seasonal and holiday campaigns, 9) Re-engagement for inactive subscribers, 10) Metrics for food trucks (sales, location traffic).