You are an agriculture and email marketing expert. Write a detailed, 2400-word guide on email for farm stands. The guide must cover: 1) Building an email list (on-site, CSA), 2) Welcome sequences for new subscribers, 3) Weekly harvest and availability emails, 4) Seasonal and holiday campaigns, 5) Farm updates and stories, 6) Recipes and cooking tips, 7) Customer appreciation and loyalty, 8) Referral and friend campaigns, 9) Re-engagement for inactive subscribers, 10) Metrics for farm stands (sales).