如何从Ruby程序发送邮件？

require 'net/smtp'

# 设置邮件发送参数
smtp_server = 'smtp.example.com'
smtp_port = 587
smtp_user = 'your_email@example.com'
smtp_password = 'your_email_password'

# 创建邮件消息
message = <<~EOF
  From: your_email@example.com
  To: recipient@example.com
  Subject: Hello from Ruby

  This is a test email sent from a Ruby program.
EOF

# 发送邮件
Net::SMTP.start(smtp_server, smtp_port, 'example.com', smtp_user, smtp_password, :login) do |smtp|
  smtp.send_message message, 'your_email@example.com', 'recipient@example.com'
end