使用Sendgrid发送多封电子邮件,但不使用X-SMTPAPI标头

我是这样做的,我认为这不是最好的解决方案,因为我正在再次加载Sendgrid配置,但它起了作用

def send
    Mail.defaults do
      delivery_method :smtp, { :address   => 'smtp.sendgrid.net',
                               :port      => 587,
                               :domain    => 'sendgrid.com',
                               :user_name => 'yourSendGridUsername',
                               :password  => 'yourSendGridPassword',
                               :authentication => 'plain',
                               :enable_starttls_auto => true }
    end

        recipients = ["users1@gmail.com", "users2@gmail.com"]

        mail = Mail.deliver do
          header['X-SMTPAPI'] =  { :to => recipients }.to_json
          to "ignore@gmail.com"
          from 'email@gmail.com'
          subject 'Ruby Example using X-SMTPAPI header'
          text_part do
            body 'You would put your content here, but I am going to say: Hello world!'
          end
          html_part do
            content_type 'text/html; charset=UTF-8'
            body '<b>Hello world!</b><br>Glad to have you here!'
          end
        end

end

我也需要 require 'mail' 在课堂上