Why does the error "Error while opening POP3 connection to "[...] Internal login failure. Refer to server log for more information." occur?
This error is no error of SmartPOP2Exchange. This is an error reported by the pop3 server when SmartPOP2Exchange tries to login. Please contact your pop3 server provider about this error. If you try to login using telnet or any other pop3 client application you should get the same error.