diff --git a/library/Ivoz/Provider/Domain/Model/Voicemail/Voicemail.php b/library/Ivoz/Provider/Domain/Model/Voicemail/Voicemail.php
index b1c3c833506..1aaaa705417 100644
--- a/library/Ivoz/Provider/Domain/Model/Voicemail/Voicemail.php
+++ b/library/Ivoz/Provider/Domain/Model/Voicemail/Voicemail.php
@@ -2,6 +2,7 @@
 
 namespace Ivoz\Provider\Domain\Model\Voicemail;
 
+use Ivoz\Core\Domain\Assert\Assertion;
 use Ivoz\Provider\Domain\Model\Language\LanguageInterface;
 
 /**
@@ -105,4 +106,13 @@ public function getLanguage(): ?LanguageInterface
 
         return $this->getCompany()->getLanguage();
     }
+
+    protected function setEmail(?string $email = null): static
+    {
+        if (!empty($email)) {
+            Assertion::email($email, 'email is not a valid email address');
+        }
+
+        return parent::setEmail($email);
+    }
 }
diff --git a/web/portal/client/src/entities/Voicemail/Voicemail.tsx b/web/portal/client/src/entities/Voicemail/Voicemail.tsx
index d7f51ae1121..d67458528d0 100644
--- a/web/portal/client/src/entities/Voicemail/Voicemail.tsx
+++ b/web/portal/client/src/entities/Voicemail/Voicemail.tsx
@@ -47,6 +47,7 @@ const properties: VoicemailProperties = {
   },
   email: {
     label: _('Email'),
+    helpText: _('Hint: only one email address is supported'),
     required: true,
   },
   attachSound: {
diff --git a/web/portal/client/src/translations/ca.json b/web/portal/client/src/translations/ca.json
index 2fa878e7f88..39904a9a201 100644
--- a/web/portal/client/src/translations/ca.json
+++ b/web/portal/client/src/translations/ca.json
@@ -234,6 +234,7 @@
   "Go to Voice Mails": "Anar als missatges de veu",
   "Group belonging": "Pertinença a grups",
   "Hint": "Pista",
+  "Hint: only one email address is supported": "Suggeriment: només es permet una adreça de correu electrònic",
   "Holiday date range_many": "Rango de festivos",
   "Holiday date range_one": "Rango de festivo",
   "Holiday date range_other": "Rango de festivos",
diff --git a/web/portal/client/src/translations/en.json b/web/portal/client/src/translations/en.json
index 8519f685275..ea796aa7d63 100644
--- a/web/portal/client/src/translations/en.json
+++ b/web/portal/client/src/translations/en.json
@@ -209,6 +209,7 @@
   "Go to Voice Mails": "Go to Voice Mails",
   "Group belonging": "Group belonging",
   "Hint": "Hint",
+  "Hint: only one email address is supported": "Hint: only one email address is supported",
   "Holiday date range_one": "Holiday date range",
   "Holiday date range_other": "Holiday dates range",
   "Holiday date_one": "Holiday date",
diff --git a/web/portal/client/src/translations/es.json b/web/portal/client/src/translations/es.json
index 9f44be6d953..88b9a012d07 100644
--- a/web/portal/client/src/translations/es.json
+++ b/web/portal/client/src/translations/es.json
@@ -234,6 +234,7 @@
   "Go to Voice Mails": "Ir a Mensajes de Voz",
   "Group belonging": "Pertenencia a grupos",
   "Hint": "Pista",
+  "Hint: only one email address is supported": "Sugerencia: solo se admite una dirección de correo electrónico",
   "Holiday date range_many": "Rango de festivos",
   "Holiday date range_one": "Rango de festivo",
   "Holiday date range_other": "Rango de festivos",
diff --git a/web/portal/client/src/translations/it.json b/web/portal/client/src/translations/it.json
index be268ae2fcb..f6c2834216b 100644
--- a/web/portal/client/src/translations/it.json
+++ b/web/portal/client/src/translations/it.json
@@ -234,6 +234,7 @@
   "Go to Voice Mails": "Vai alle caselle vocali",
   "Group belonging": "Appartenenza al gruppo",
   "Hint": "Suggerimento",
+  "Hint: only one email address is supported": "Suggerimento: è supportato solo un indirizzo email",
   "Holiday date range_many": "Holiday dates range",
   "Holiday date range_one": "Holiday date range",
   "Holiday date range_other": "Holiday dates range",