如何在.rb文件中呈现邮件程序模板(无模板文件)

require 'net/smtp'

def send_email(to, subject, body)
  from = 'your_email@example.com'
  message = <<~MESSAGE
    From: #{from}
    To: #{to}
    Subject: #{subject}

    #{body}
  MESSAGE

  smtp = Net::SMTP.new('smtp.example.com', 587)
  smtp.enable_starttls_auto
  smtp.start('example.com', 'your_email@example.com', 'your_password', :login) do |smtp|
    smtp.send_message(message, from, to)
  end
end

# 调用send_email方法发送邮件
send_email('recipient@example.com', 'Hello', 'This is the email body.')