C#发送电子邮件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Mail;
using System.Net.Mime;
using System.IO;
using System.Net;

namespace _11发送电子邮件
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("用户名");
            string uid = Console.ReadLine();//发件人邮箱地址@符号前面的字符tom@dddd.com,则为"tom"
            Console.WriteLine("密码");//发件人邮箱的密码
            string pwd = Console.ReadLine();
            for (int i = 0; i < 20; i++) //连发20封，嘿嘿
            {
                MailAddress from = new MailAddress("发件人的邮箱地址");
                MailAddress to = new MailAddress("收件人的邮箱地址");
                MailMessage mailMessage = new MailMessage(from, to);
                mailMessage.Subject = "Test";//邮件主题
                mailMessage.Body = "Hello, world!!";//邮件正文

                //添加附件

                string file1 = "test.txt";
                Attachment attachment1 = new Attachment(file1, MediaTypeNames.Text.Plain);
                //为附件天剑时间信息
                ContentDisposition disposition1 = attachment1.ContentDisposition;
                disposition1.CreationDate = File.GetCreationTime(file1);
                disposition1.ModificationDate = File.GetLastWriteTime(file1);
                disposition1.ReadDate = File.GetLastAccessTime(file1);
                mailMessage.Attachments.Add(attachment1);

                string file2 = "test.doc";
                Attachment attachment2 = new Attachment(file2);
                //为附件添加时间信息
                ContentDisposition disposition2 = attachment2.ContentDisposition;
                disposition2.CreationDate = File.GetCreationTime(file2);
                disposition2.ModificationDate = File.GetLastWriteTime(file2);
                disposition2.ReadDate = File.GetLastAccessTime(file2);
                mailMessage.Attachments.Add(attachment2);

                //实例化SmtpClient
                SmtpClient smtpClient = new SmtpClient("smtp.yeah.net", 25);
                //设置验证发件人身份的凭据
                smtpClient.Credentials = new NetworkCredential(uid, pwd);
                //发送
                smtpClient.Send(mailMessage);

                Console.WriteLine("OK - [{0}]",i);
            }

            Console.ReadKey();
        }
    }
}