非常好的标准c++网络通讯开源库，支持tcp,udp，ssl,支持smtp和pop3邮件协议,Very good standard c++ network communication open-source database, to support tcp, udp, ssl, support for pop3 and smtp e-mail agreement

开发语言是C#，可以用于发送邮件，运行时修改数据库名，登录名和密码和邮箱地址-Development language is C#, can be used to send mail, run-time modify the database name, login name and password and email address