<?php

/* @var $this yii\web\View */
/* @var $user common\models\User */
$activationLink = Yii::$app->urlManager->createAbsoluteUrl ( [ 
		'validation/validation',
		'token' => $user->activation_key 
] );
?>
Dear Administator,

A new user signed up!

Follow the link below to validate the new user:

<?= $activationLink?>