C# 发送邮件，QQ企业邮箱测试成功

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","深师家园", "admin@**.com", "admin@***.com", "***", "您好！", "这是一封测试邮件!");
        }
     
        /// <summary>
        /// 向用户发送邮件
        /// </summary>
        /// <param name="ReceiveUser">接收邮件的用户</param>
        /// <param name="SendUser">发送者显求的邮箱地址,可为空</param>
        /// <param name="DisplayName">收件人显示发件人的联系人名，可为中文</param>
        /// <param name="SendUserName">发送者的邮箱登陆名，可以与发送者地址一样</param>
        /// <param name="UserPassword">发送者的登陆密码</param>
        /// <param name="MailTitle">发送标题</param>
        /// <param name="MailContent">发送的内容</param>
        public static void sendMail(string ReceiveUser,  string DisplayName,string SendUser, string SendUserName, string UserPassword, string MailTitle, string MailContent)
        {
            MailAddress toMail = new MailAddress(ReceiveUser);//接收者邮箱
            MailAddress fromMail = new MailAddress(SendUser, DisplayName);//发送者邮箱       
            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";//设置发送者邮箱对应的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();
        }
    }
}