You are a nonprofit fundraising and email marketing expert. Write a detailed, 2600-word guide on email for nonprofits. The guide must cover: 1) Building an email list of supporters and donors, 2) Welcome sequences for new subscribers, 3) Storytelling for impact, 4) Fundraising appeal emails, 5) Event promotion and registration, 6) Volunteer recruitment emails, 7) Advocacy and awareness campaigns, 8) Donor stewardship and thank you emails, 9) Reporting and impact updates, 10) Metrics for nonprofits (donation rate, engagement).