c# qq发送邮件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;

namespace smtp发送邮件
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] myArray = new string[] { "1305379200@qq.com" };
            string[] attachmentsPathArray = new string[] { ""};
            SendMessage("932798303@qq.com", "lk", "akfcmswbmzihbfjb", "smtp.qq.com", 25, myArray, myArray, "测试","zcq测试", null);
        }

        /// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="userEmailAddress">发件人地址</param>
        /// <param name="userName">发件人姓名(可为空)</param>
        /// <param name="password">密码</param>
        /// <param name="host">邮件服务器地址</param>
        /// <param name="port"></param>
        /// <param name="sendToList">收件人(多个电子邮件地址之间必须用逗号字符（“,”）分隔)</param>
        /// <param name="sendCCList">抄送人(多个电子邮件地址之间必须用逗号字符（“,”）分隔)</param>
        /// <param name="subject">主题</param>
        /// <param name="body">内容</param>
        /// <param name="attachmentsPath">附件路径</param>
        /// <param name="errorMessage">错误信息</param>
        public static bool SendMessage(string userEmailAddress, string userName, string password, string host, int port,
            string[] sendToList, string[] sendCCList, string subject, string body, string[] attachmentsPath)
        {
            var errorMessage = string.Empty;
            SmtpClient client = new SmtpClient();
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(userEmailAddress, password);//用户名、密码
            client.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式    
            client.Host = host;//邮件服务器
            client.Port = port;//端口号 非SSL方式，默认端口号为：25


            MailMessage msg = new MailMessage();
            //加发件人
            foreach (string send in sendToList)
            {
                msg.To.Add(send);
            }
            //加抄送
            foreach (string cc in sendCCList)
            {
                msg.To.Add(cc);
            }

            //在有附件的情况下添加附件
            if (attachmentsPath != null && attachmentsPath.Length > 0)
            {
                foreach (string path in attachmentsPath)
                {
                    var attachFile = new Attachment(path);
                    msg.Attachments.Add(attachFile);
                }
            }
            msg.From = new MailAddress(userEmailAddress, userName);//发件人地址
            msg.Subject = subject;//邮件标题   
            msg.Body = body;//邮件内容   
            msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码   
            msg.IsBodyHtml = true;//是否是HTML邮件   
            msg.Priority = MailPriority.High;//邮件优先级   

            try
            {
                client.Send(msg);
                return true;
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                errorMessage = ex.Message;
                return false;
            }
        }

    }
}

参考
https://www.cnblogs.com/bruceli-net/p/Email.html
https://www.cnblogs.com/bruceli-net/p/Email.html