How to achieve Email Validation - with 2 different messages

In email validation - tutorial IBM build a quick web: if it is left
blank, the message displays "enter a valid email".

How to make it so it displays "this field cannot be left blank" ?

Only when something not-email entered in it so does it display "enter
a valid email" ...

I see we at least need to create 2 validation for email field ? the
below is what is being used at the moment:

class User extends AppModel
{
var $name = 'User';

var $validate = array (
'username' => array ('rule' => '/^.{6,40}$/'),
'password' => array('rule'=>'/^.{6,40}$/'),
'email' => array('rule'=> array('email', true),
'message' => 'Enter a valid email')

);

}

Any help with this ?

Thanks !

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