diff --git a/src/tests/Feature/Stories/GreylistTest.php b/src/tests/Feature/Stories/GreylistTest.php
--- a/src/tests/Feature/Stories/GreylistTest.php
+++ b/src/tests/Feature/Stories/GreylistTest.php
@@ -458,6 +458,19 @@
         );
 
         $this->assertFalse($request->shouldDefer());
+
+
+        // Ensure we also find the setting by alias
+        $aliases = $this->domainOwner->aliases()->orderBy('alias')->get();
+        $request = new Greylist\Request(
+            [
+                'sender' => 'someone@sender.domain',
+                'recipient' => $aliases[0]->alias,
+                'client_address' => $this->clientAddress
+            ]
+        );
+
+        $this->assertFalse($request->shouldDefer());
     }
 
     public function testUserEnabled()
diff --git a/src/tests/TestCaseTrait.php b/src/tests/TestCaseTrait.php
--- a/src/tests/TestCaseTrait.php
+++ b/src/tests/TestCaseTrait.php
@@ -389,11 +389,20 @@
             ]
         );
 
+        $this->getTestDomain(
+            'test2.domain2',
+            [
+                'type' => \App\Domain::TYPE_EXTERNAL,
+                'status' => \App\Domain::STATUS_ACTIVE | \App\Domain::STATUS_CONFIRMED | \App\Domain::STATUS_VERIFIED
+            ]
+        );
+
         $packageKolab = \App\Package::where('title', 'kolab')->first();
 
         $this->domainOwner = $this->getTestUser('john@test.domain', ['password' => $this->userPassword]);
         $this->domainOwner->assignPackage($packageKolab);
         $this->domainOwner->setSettings($this->domainOwnerSettings);
+        $this->domainOwner->setAliases(['alias1@test2.domain2']);
 
         // separate for regular user
         $this->jack = $this->getTestUser('jack@test.domain', ['password' => $this->userPassword]);