一、设置163邮箱的授权码

二、发送邮件的相关代码

using System;
using System.Net.Mail;


namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            using (MailMessage mailMessage = new MailMessage())
            using (SmtpClient smtpClient = new SmtpClient("smtp.163.com"))//SMTP服务器
            {
                mailMessage.To.Add("888888@qq.com"); //接收邮箱
                mailMessage.Body = "这里写邮件正文";//邮件正文
                mailMessage.From = new MailAddress("18468003528@163.com");//发送邮箱
                mailMessage.Subject = "这里写邮件标题";//邮件标题
                smtpClient.Credentials = new System.Net.NetworkCredential("****@163.com","****");//参数填smtp用户名、授权码
                smtpClient.Send(mailMessage);
            }
            Console.ReadKey();
        }
    }
}