发送邮件

private void button1_Click(object sender, EventArgs e)
    {
        using (MailMessage msg = new MailMessage())
        {
            msg.From = new MailAddress("邮箱");//最好是smtp上注册的邮箱
            msg.Subject = "test";
            msg.Body = "asdasdasdasd   Test";


            msg.To.Add("收件邮箱");//这个地址，可以随便
            

            using (SmtpClient client = new SmtpClient("smtp.office365.com", 587))
            {
                client.EnableSsl = true;
                client.Credentials = new NetworkCredential("邮箱", "密码");//这个邮箱和密码需要在对应的SMTP上注册的邮箱
                client.Timeout = 100000;
                client.Send(msg);
            }
            
        }
    }