C# 發送郵件，QQ企業郵箱測試成功

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Mail;
using System.Net;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            sendMail("**@**.cn","深師家園", "admin@**.com", "admin@***.com", "***", "您好！", "這是一封測試郵件!");
        }
     
        /// <summary>
        /// 向用戶發送郵件
        /// </summary>
        /// <param name="ReceiveUser">接收郵件的用戶</param>
        /// <param name="SendUser">發送者顯求的郵箱地址,可為空</param>
        /// <param name="DisplayName">收件人顯示發件人的聯系人名，可為中文</param>
        /// <param name="SendUserName">發送者的郵箱登陸名，可以與發送者地址一樣</param>
        /// <param name="UserPassword">發送者的登陸密碼</param>
        /// <param name="MailTitle">發送標題</param>
        /// <param name="MailContent">發送的內容</param>
        public static void sendMail(string ReceiveUser,  string DisplayName,string SendUser, string SendUserName, string UserPassword, string MailTitle, string MailContent)
        {
            MailAddress toMail = new MailAddress(ReceiveUser);//接收者郵箱
            MailAddress fromMail = new MailAddress(SendUser, DisplayName);//發送者郵箱       
            MailMessage mail = new MailMessage(fromMail, toMail);
            mail.Subject = MailTitle;
            mail.IsBodyHtml = true;//是否支持HTML
            mail.Body = MailContent;          
            SmtpClient client = new SmtpClient();
            client.Host = "smtp.exmail.qq.com";//設置發送者郵箱對應的smtpserver
            client.UseDefaultCredentials = false;         
            //client.Port = 465;
            client.Credentials = new NetworkCredential(SendUserName, UserPassword);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            try
            {
                client.Send(mail);
            }
            catch(SmtpException ex)
            {
                Console.Write(ex.Message);
            }
            Console.ReadKey();
        }
    }
}