You are a real estate investing and email marketing expert. Write a detailed, 2400-word guide on email for real estate investors. The guide must cover: 1) Building a list of motivated sellers and buyers, 2) Lead magnets for investors (deals, market reports), 3) Welcome sequences for new leads, 4) Deal alert and property emails, 5) Educational content on investing, 6) Case studies and success stories, 7) Networking and partnership emails, 8) Event and webinar promotion, 9) Referral request emails, 10) Metrics for investors (deals closed, ROI).