调用lumisoft组件发邮件 不需要身份验证 不需要密码

        /// <summary>
        /// 调用lumisoft发送邮件
        /// </summary>
        /// <param name="fromEmailAddr">发送者的邮件地址</param>
        /// <param name="toEmailAddr">给谁发的邮件地址</param>
        /// <param name="subjectText">主题</param>
        /// <param name="bodyText">正文</param>
        /// <param name="filePath">附件路径</param>
        /// <returns>成功与否</returns>
        public bool SendMailByLumisoft(string fromEmailAddr, string toEmailAddr, string subjectText, string bodyText, string filePath)
        {
            Mime m = new Mime();
            MimeEntity mainEntity = m.MainEntity;
            // Force to create From: header field  
            mainEntity.From = new AddressList();
            mainEntity.From.Add(new MailboxAddress(fromEmailAddr, fromEmailAddr));
            // Force to create To: header field  
            mainEntity.To = new AddressList();
            mainEntity.To.Add(new MailboxAddress(toEmailAddr, toEmailAddr));
            mainEntity.Subject = subjectText;
            //添加正文  
            mainEntity.ContentType = MediaType_enum.Multipart_mixed;
            MimeEntity textEntity = mainEntity.ChildEntities.Add();
            textEntity.ContentType = MediaType_enum.Text_html;
            textEntity.ContentTransferEncoding = ContentTransferEncoding_enum.Base64;
            textEntity.DataText = bodyText;
            //发送附件  
            if (!string.IsNullOrEmpty(filePath))
            {
                MimeEntity attachmentEntity = new MimeEntity();
                attachmentEntity.ContentType = MediaType_enum.Application_octet_stream;
                attachmentEntity.ContentDisposition = ContentDisposition_enum.Attachment;
                attachmentEntity.ContentTransferEncoding = ContentTransferEncoding_enum.Base64;
                attachmentEntity.ContentDisposition_FileName = filePath;
                attachmentEntity.DataFromFile(filePath);
                mainEntity.ChildEntities.Add(attachmentEntity);
            }
            try
            {
                SMTP_Client.QuickSend(m);
                return true;
            }
            catch (Exception e)
            {
                Console.Write(e.StackTrace);
                return false;
            }
        }