KLMail收邮件 用pop3收邮件。用到socket/base64+pq解码/内码转换/多线程等技术。核心用SDK方式写，界面交互用MFC。-KLMail received pop3 mail received by mail. Pq used socket/base64 decoder / code conversion / multithreading technology. Core SDK used to write, interactive interface with MFC.