上图看效果 MailHelper: public class MailHelper { public bool SendMail(MailSender sender,out string errorMsg) { //声明一个Mail对象 MailMessage mymail = new MailMessage(); //发件人地址 //如是自己,在此输入自己的邮箱 mymail.From = new MailAddress(sender.SendAddress,sender.SendNickNa