1:开通个人smtp:

 

2:账户下开通smtp:

 

会发短信收到授权码：smurdizujnjgcacj（留着有用）；

3：干活来了：（代码比较简单）

var client = new SmtpClient("smtp.qq.com")
{
EnableSsl = true,
UseDefaultCredentials = false,
Credentials = new System.Net.NetworkCredential("1632694570@qq.com", "smurdizujnjgcacj")
};
MailAddress from = new MailAddress("1632694570@qq.com", "磅管家科技", Encoding.UTF8);//初始化发件人
MailAddress to = new MailAddress("953706194@qq.com", "雷榕", Encoding.UTF8);//初始化收件人
////设置邮件内容
MailMessage message = new MailMessage(from, to)
{
Body = "测试",
BodyEncoding = Encoding.UTF8,
Subject = "测试",
SubjectEncoding = Encoding.UTF8,
IsBodyHtml = true
};
client.Send(message);

完成！