Net.Mail发送邮件，附件变成了乱码(dat文件)
代码：

string strSmtpServer = smtpServer;
            string strFrom = mailFrom;
            string strMailProxyUser = mailProxyUser;
            string strMailProxyPass = mailProxyPassword;
            SmtpClient client = new SmtpClient(strSmtpServer);
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(strMailProxyUser, strMailProxyPass);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.Port = 25;
            client.Timeout = 3000000;
            MailAddress from = new MailAddress(strFrom);
            MailAddress to = new MailAddress(strTo, strToDisplayName);
            System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(from, to);
            message.Subject = strSubject;
            message.Body = strBody;
            System.Net.Mail.Attachment attachment = null;
            message.SubjectEncoding = Encoding.UTF8;
            message.HeadersEncoding = Encoding.UTF8;
            message.BodyEncoding = Encoding.UTF8;
            message.IsBodyHtml = true;
            if (attachmentFiles != null)
            {
                foreach (string files in attachmentFiles)
                {
                    if (System.IO.File.Exists(files))
                    {
                        attachment = new System.Net.Mail.Attachment(files);
                        attachment.NameEncoding = Encoding.UTF8;                      
                        message.Attachments.Add(attachment); 
 
                    }
                }
            }

            try
            {
                client.Send(message);
            }
            catch (Exception ex)
            {
                DebugWrite("发送邮件出现问题了" + ex.ToString());
            }
            finally
            {
                foreach (Attachment item in message.Attachments)
                {
                    item.Dispose();
                }
                if (attachment != null)
                {
                    attachment.Dispose();
                }
                message.Dispose();
            }

下面是附件出现的乱码：
=?utf-8?B?byttVWdPUzRrK2FJdCtXZnV1bUhrZWkxPz0NCiA9P3V0Zi04P0I/aE9T?=\
\
=?utf-8?B?NnArUzhzT1dBdk9paHFESXdNVE13TmpFM0xuaHNjdz09Pz0=?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment

我本机测试是没有问题的，但是部署到服务器上发送邮件时，附件就会出现乱码，正文和标题都是正常的。

自己估计：可能跟附件的名称是中文有关系，但是不知道如何修改。

请求指点。


[解决办法]
没遇到过，帮顶下
[解决办法]

引用:

http://blog.sina.com.cn/s/blog_62fda93c010191fc.html

这楼可以看
[解决办法]
嗯，，百度了很久，，这个http://blog.sina.com.cn/s/blog_62fda93c010191fc.html 真的不错