diff --git a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/AccountLinkChecker.php b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/AccountLinkChecker.php
index e1bb71b9d4..499ad03aa7 100644
--- a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/AccountLinkChecker.php
+++ b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/AccountLinkChecker.php
@@ -59,15 +59,13 @@ class AccountLinkChecker implements LinkChecker
             return false;
         }
 
-        $emailIds = $entity->getLinkMultipleIdList('emails');
+        $emailId = $entity->get('originalEmailId');
 
-        if (count($emailIds) === 0 || count($emailIds) > 1) {
+        if (!$emailId) {
             return false;
         }
 
-        $email = $this->entityManager
-            ->getRepositoryByClass(Email::class)
-            ->getById($emailIds[0]);
+        $email = $this->entityManager->getRepositoryByClass(Email::class)->getById($emailId);
 
         if (!$email) {
             return false;
diff --git a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/ContactLinkChecker.php b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/ContactLinkChecker.php
index 8ac4c2b156..86cae5d3f9 100644
--- a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/ContactLinkChecker.php
+++ b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/ContactLinkChecker.php
@@ -59,15 +59,13 @@ class ContactLinkChecker implements LinkChecker
             return false;
         }
 
-        $emailIds = $entity->getLinkMultipleIdList('emails');
+        $emailId = $entity->get('originalEmailId');
 
-        if (count($emailIds) === 0 || count($emailIds) > 1) {
+        if (!$emailId) {
             return false;
         }
 
-        $email = $this->entityManager
-            ->getRepositoryByClass(Email::class)
-            ->getById($emailIds[0]);
+        $email = $this->entityManager->getRepositoryByClass(Email::class)->getById($emailId);
 
         if (!$email) {
             return false;
diff --git a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/LeadLinkChecker.php b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/LeadLinkChecker.php
index 97263b8ed1..dcad18a1c7 100644
--- a/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/LeadLinkChecker.php
+++ b/application/Espo/Modules/Crm/Classes/Acl/Case/LinkCheckers/LeadLinkChecker.php
@@ -59,15 +59,14 @@ class LeadLinkChecker implements LinkChecker
             return false;
         }
 
-        $emailIds = $entity->getLinkMultipleIdList('emails');
 
-        if (count($emailIds) === 0 || count($emailIds) > 1) {
+        $emailId = $entity->get('originalEmailId');
+
+        if (!$emailId) {
             return false;
         }
 
-        $email = $this->entityManager
-            ->getRepositoryByClass(Email::class)
-            ->getById($emailIds[0]);
+        $email = $this->entityManager->getRepositoryByClass(Email::class)->getById($emailId);
 
         if (!$email) {
             return false;
diff --git a/tests/integration/Espo/Record/LinkTest.php b/tests/integration/Espo/Record/LinkTest.php
index deebfd1145..94c4ac2ddb 100644
--- a/tests/integration/Espo/Record/LinkTest.php
+++ b/tests/integration/Espo/Record/LinkTest.php
@@ -320,7 +320,7 @@ class LinkTest extends BaseTestCase
             'assignedUserId' => $user->getId(),
             'leadId' => $lead->getId(),
             'accountId' => $account->getId(),
-            'emailsIds' => [$email->getId()]
+            'originalEmailId' => $email->getId(),
         ], CreateParams::create());
 
         //
@@ -357,7 +357,7 @@ class LinkTest extends BaseTestCase
             'name' => '1',
             'assignedUserId' => $user->getId(),
             'accountId' => $account->getId(),
-            'emailsIds' => [$email->getId()]
+            'originalEmailId' => $email->getId(),
         ], CreateParams::create());
 
         //
@@ -399,8 +399,30 @@ class LinkTest extends BaseTestCase
             'accountId' => $account->getId(),
             'contactId' => $contact->getId(),
             'contactsIds' => [$contact->getId()],
-            'emailsIds' => [$email->getId()]
+            'originalEmailId' => $email->getId(),
         ], CreateParams::create());
+
+        // Should not allow more than 1 ID.
+
+        $contactAnother = $this->getEntityManager()->createEntity(Contact::ENTITY_TYPE);
+
+        $isThrown = false;
+
+        try {
+            /** @noinspection PhpUnhandledExceptionInspection */
+            $caseService->create((object) [
+                'name' => '1',
+                'assignedUserId' => $user->getId(),
+                'contactId' => $contact->getId(),
+                'contactsIds' => [$contact->getId(), $contactAnother->getId()],
+                'originalEmailId' => $email->getId(),
+            ], CreateParams::create());
+        }
+        catch (Forbidden) {
+            $isThrown = true;
+        }
+
+        $this->assertTrue($isThrown);
     }
 
     public function testLoadNames(): void