发邮件：

using LumiSoft.Net.SMTP.Client;


Mime m = new Mime();
MimeEntity mainEntity = m.MainEntity;
// Force to create From: header field
mainEntity.From = new AddressList();
mainEntity.From.Add(new MailboxAddress(txtFrom.Text, txtFrom.Text));
 // Force to create To: header field
 mainEntity.To = new AddressList();
 mainEntity.To.Add(new MailboxAddress(txtTo.Text, txtTo.Text));
mainEntity.Subject = txtSubject.Text;
//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 = txtBody.Text;
//发送附件
  MimeEntity attachmentEntity = new MimeEntity();
  attachmentEntity.ContentType = MediaType_enum.Application_octet_stream;
  attachmentEntity.ContentDisposition = ContentDisposition_enum.Attachment;
  attachmentEntity.ContentTransferEncoding = ContentTransferEncoding_enum.Base64;
  attachmentEntity.ContentDisposition_FileName = "c:/test.jpg";
  attachmentEntity.DataFromFile("c:/test.jpg");
    
  mainEntity.ChildEntities.Add(attachmentEntity);
    
  SMTP_Client.QuickSend(m);

using LumiSoft.Net.POP3.Client;
using LumiSoft.Net;
using LumiSoft.Net.Mime;

public List<Mime> GetEmails(string pop3Server, string pop3Port, string username, string password)
        {
            bool pop3UseSsl = false;
            List<string> gotEmailIds = new List<string>();
            List<Mime> result = new List<Mime>();
            using (POP3_Client pop3 = new POP3_Client())
            {
                try
                {
                    pop3.Connect(pop3Server, Convert.ToInt32(pop3Port), pop3UseSsl);
                    pop3.Authenticate(username, password, false);
                    POP3_ClientMessageCollection infos = pop3.Messages;
                    foreach (POP3_ClientMessage info in infos)
                    {
                        if (gotEmailIds.Contains(info.UID))
                            continue;
                        byte[] bytes = info.MessageToByte();
                        gotEmailIds.Add(info.UID);
                        Mime mime = Mime.Parse(bytes);
                        result.Add(mime);
                    }
                }
                catch (Exception ex)
                {
                    throw new Exception(ex.Message);
                }
            }
            return result;
        }

using LumiSoft.Net.POP3.Client;
using LumiSoft.Net;
using LumiSoft.Net.Mime;