diff --git a/lib/Entities/SubscriberEntity.php b/lib/Entities/SubscriberEntity.php
index 97f376ae40..821c93dbff 100644
--- a/lib/Entities/SubscriberEntity.php
+++ b/lib/Entities/SubscriberEntity.php
@@ -11,6 +11,7 @@ use MailPoet\Util\Helpers;
 use MailPoetVendor\Doctrine\Common\Collections\ArrayCollection;
 use MailPoetVendor\Doctrine\Common\Collections\Collection;
 use MailPoetVendor\Doctrine\ORM\Mapping as ORM;
+use MailPoetVendor\Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @ORM\Entity()
@@ -58,6 +59,8 @@ class SubscriberEntity {
 
   /**
    * @ORM\Column(type="string")
+   * @Assert\Email()
+   * @Assert\NotBlank()
    * @var string
    */
   private $email;