using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Net;

using System.Net.Mail;

using System.Text;

namespace Test

{

    public static class SmtpTest

    {

        /// <summary>

        /// 如果企业QQ邮箱设置了微信授权登陆的,则发送失败

        /// </summary>

        public static void SendEmail()

        {

            string sender = "121212121212@qq.com";

            string pwd = "***********";

            var message = new MailMessage();

            message.From = new MailAddress(sender, "寄件人显示名称");

            message.To.Add(new MailAddress("111111@qq.com","收件人显示名称"));

            message.Subject = "测试";

            message.Body = "测试";

            message.IsBodyHtml = false;

            using (var smtpClient = new SmtpClient())

            {

                //之前遇到过一个坑,公司运维为了安全设置了企业QQ邮箱微信授权登陆的

                //后来偶然发现自动发送邮件的服务总是发送不成功

                //查询了发久没有找到原因,偶然把这个设置关闭了,才发送成功

                smtpClient.UseDefaultCredentials = false;

                smtpClient.Host = "smtp.exmail.qq.com";

                smtpClient.Port = ;//生产环境推荐使用:465

                smtpClient.EnableSsl = false;//生产环境推荐使用:true

                smtpClient.Credentials = new NetworkCredential(sender, pwd);

                smtpClient.Send(message);

            }

        }

    }

}