diff --git a/src/Model/Filter.php b/src/Model/Filter.php
index 86a2640..dd6686c 100644
--- a/src/Model/Filter.php
+++ b/src/Model/Filter.php
@@ -4,6 +4,9 @@ namespace Opdavies\GmailFilterBuilder\Model;
 
 class Filter
 {
+    /** @var string */
+    const SEPARATOR = '|';
+
     /**
      * @var array
      */
@@ -100,12 +103,13 @@ class Filter
     /**
      * Filter a message if it was sent from a mailing list.
      *
-     * @param $value The mailing list address
+     * @param string|array $value The mailing list address
      *
      * @return $this
      */
     public function fromList($value)
     {
+        $value = collect($value)->implode(self::SEPARATOR);
         $this->has("list:{$value}");
 
         return $this;
diff --git a/tests/Unit/Model/FilterTest.php b/tests/Unit/Model/FilterTest.php
index 8de48fc..e7063f0 100644
--- a/tests/Unit/Model/FilterTest.php
+++ b/tests/Unit/Model/FilterTest.php
@@ -143,6 +143,11 @@ class FilterTest extends TestCase
             ['hasTheWord' => 'list:foobar'],
             $this->filter->fromList('foobar')->toArray()
         );
+
+        $this->assertEquals(
+            ['hasTheWord' => 'list:list-one.com|list-two.com'],
+            $this->filter->fromList(['list-one.com', 'list-two.com'])->toArray()
+        );
     }
 
     /**