diff --git a/lib/Subscribers/ImportExport/Import/Import.php b/lib/Subscribers/ImportExport/Import/Import.php
index d17323c510..dda7c75093 100644
--- a/lib/Subscribers/ImportExport/Import/Import.php
+++ b/lib/Subscribers/ImportExport/Import/Import.php
@@ -159,7 +159,7 @@ class Import {
             if(!is_email($email)) {
               $invalid_records[] = $index;
             }
-            return $email;
+            return strtolower($email);
           }, array_keys($data), $data
         );
       }
diff --git a/tests/unit/Subscribers/ImportExport/Import/ImportTest.php b/tests/unit/Subscribers/ImportExport/Import/ImportTest.php
index 7317f932f0..f1e8bf7ab6 100644
--- a/tests/unit/Subscribers/ImportExport/Import/ImportTest.php
+++ b/tests/unit/Subscribers/ImportExport/Import/ImportTest.php
@@ -23,7 +23,7 @@ class ImportTest extends \MailPoetTest {
         array(
           'Adam',
           'Smith',
-          'adam@smith.com',
+          'Adam@smith.com', // capitalized to test normalization
           'France'
         ),
         array(