====== web.php ======

===== Gii aktivieren =====

Ausserhalb des $config-Arrays: 
<code php>
if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = 'yii\debug\Module';

    $config['bootstrap'][] = 'gii';
    //$config['modules']['gii'] = 'yii\gii\Module';
	$config['modules']['gii']['class'] = 'yii\gii\Module';
	$config['modules']['gii']['allowedIPs'] = ['192.168.0.*'];  
}
</code>

===== Mailer ===== 

Swiftmailer installieren über Composer? 
<code php>
'mail' => [
            'class' => 'yii\swiftmailer\Mailer',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.
            'viewPath' => '@app/mail',
        	'useFileTransport' => false,//set this property to false to send mails to real email addresses
    		    //comment the following array to send mail using php's mail function
	        'transport' => [
            	'class' => 'Swift_SmtpTransport',
            	'host' => 'smtp.mailgun.org',
            	'username' => 'postmaster@example.ch',
            	'password' => 'ewfwefewhiu',
            	'port' => '587',
            	'encryption' => 'tls',
            ],
        ],
</code>

http://www.yiiframework.com/doc-2.0/yii-swiftmailer-mailer.html