C#代码发送邮件

本次测试的邮箱为163邮箱

1、首相对邮箱进行一些设置（详见下图）；打开设置选取客户端授权密码项，开启设置；以后在客户端登录时将使用刚刚设置的密码！

2、上干货

  public static void TestEmail2()
         {
             try
             {
                 //确定smtp服务器地址。实例化一个Smtp客户端
                 System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient("smtp.163.com ");
                 //生成一个发送地址
                 string strFrom = string.Empty;
                 strFrom = "发送的邮箱@163.com";
                 //构造一个发件人地址对象
                 MailAddress from = new MailAddress(strFrom, "发件人", Encoding.UTF8);
                 //构造一个收件人地址对象 例如123456@qq.com
                 MailAddress to = new MailAddress("收件邮箱", "收件人", Encoding.UTF8);
                 //构造一个Email的Message对象
                 MailMessage message = new MailMessage(from, to);
                 //得到文件名
                 string fileName = @"附件文件地址";
                 //判断文件是否存在
                 if (File.Exists(fileName))
                 {
                     //构造一个附件对象
                     Attachment attach = new Attachment(fileName);
                     //得到文件的信息
                     ContentDisposition disposition = attach.ContentDisposition;
                     disposition.CreationDate = System.IO.File.GetCreationTime(fileName);
                     disposition.ModificationDate = System.IO.File.GetLastWriteTime(fileName);
                     disposition.ReadDate = System.IO.File.GetLastAccessTime(fileName);
                     //向邮件添加附件
                     message.Attachments.Add(attach);
                 }
                 else
                 {
                     Log4Net.LogHelper.WriteLog(typeof(EmailService), "文件" + fileName + "未找到！");
                 }
                 //添加邮件主题和内容
                 message.Subject = "主题";
                 message.SubjectEncoding = Encoding.UTF8;
                 message.Body = "邮件内容";
                 message.BodyEncoding = Encoding.UTF8;
                 //设置邮件的信息
                 client.DeliveryMethod = SmtpDeliveryMethod.Network;
                 message.BodyEncoding = System.Text.Encoding.UTF8;
                 message.IsBodyHtml = false;

                 //gmail支持，163不支持，如果是gmail则一定要将其设为true
                 client.EnableSsl = false;

                 //设置用户名和密码。
                 client.UseDefaultCredentials = false;
                 string username = "邮箱名（无163后缀）";
                 string passwd = "刚刚设置的客户端授权码";
                 //用户登陆信息
                 NetworkCredential myCredentials = new NetworkCredential(username, passwd);
                 client.Credentials = myCredentials;
                 //发送邮件
                 client.Send(message);
                 //提示发送成功
             }
             catch (Exception ex)
             {
                 Log4Net.LogHelper.WriteLog(typeof(EmailService), ex.Message);
             }
         }