Update framework/validators/CEmailValidator.php

If fsockopen error "Connection refused" (error code: 61) is reached, yii hangs with uncatched "HTTP/1.1 500 Internal Server Error".

Got this issue when used validate rule:
```php
array('email', 'email', 'checkMX'=>true, 'checkPort'=>true, 'validateIDN'=>true),
```

Output html code:
```html
<h1>PHP Error [2]</h1>
<p>fsockopen() [<a href='function.fsockopen'>function.fsockopen</a>]: unable to connect to mail.somedomain.com:25 (Connection refused)</p>
```