【此代码为课程作业，仅用于学习和交流】本程序使用SMTP服务根据字典枚举指定邮箱的密码，通过判断SMTP

服务器返回的信息验证密码是否正确

字典文件为dic.txt

指定邮箱名在username.txt中，支持多个用户名

破解的用户名和密码会记录在result.txt中-[the code for the course work, only to learn and exchange] this program uses the SMTP service according to the dictionary enumeration specified mailbox password, via the SMTP

The information returned by the server authentication password is correct

The dictionary file is dic.txt

The specified mailbox name in username.txt, support multiple user name

Break the user name and password will be recorded in the result.txt