Fiz o capitulo 6 do livro CodeIgniter, fui testar e deu esses erros
Severity: Warning
Message: fsockopen(): unable to connect to http://localhost/exemplos_livro_ci/cap1/:25 (Unable to find the socket transport “http” - did you forget to enable it when you configured PHP?)
Filename: libraries/Email.php
Line Number: 2016
Backtrace:
File: C:\wamp64\www\exemplos_livro_ci\cap1\application\controllers\Contato.php
Line: 95
Function: send
File: C:\wamp64\www\exemplos_livro_ci\cap1\application\controllers\Contato.php
Line: 25
Function: SendEmailToAdmin
File: C:\wamp64\www\exemplos_livro_ci\cap1\index.php
Line: 308
Function: require_once