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;                    &