smtp自动发送邮件demo

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 = 25;//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);
            }
        }
    }
}