You are a real estate and email marketing expert. Write a detailed, 2500-word guide on email for property managers. The guide must cover: 1) Building an email list of tenants and owners, 2) Welcome sequences for new tenants, 3) Rental reminders and payment emails, 4) Maintenance and service updates, 5) Community and event emails, 6) Lease renewal and reminders, 7) Referral and review requests, 8) Owner and investor updates, 9) Marketing available properties, 10) Metrics for property managers (retention, occupancy).