diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2038,6 +2038,7 @@
     'PhabricatorMetaMTAMailSection' => 'applications/metamta/view/PhabricatorMetaMTAMailSection.php',
     'PhabricatorMetaMTAMailTestCase' => 'applications/metamta/storage/__tests__/PhabricatorMetaMTAMailTestCase.php',
     'PhabricatorMetaMTAMailableDatasource' => 'applications/metamta/typeahead/PhabricatorMetaMTAMailableDatasource.php',
+    'PhabricatorMetaMTAMailableFunctionDatasource' => 'applications/metamta/typeahead/PhabricatorMetaMTAMailableFunctionDatasource.php',
     'PhabricatorMetaMTAMailgunReceiveController' => 'applications/metamta/controller/PhabricatorMetaMTAMailgunReceiveController.php',
     'PhabricatorMetaMTAMailingList' => 'applications/mailinglists/storage/PhabricatorMetaMTAMailingList.php',
     'PhabricatorMetaMTAMemberQuery' => 'applications/metamta/query/PhabricatorMetaMTAMemberQuery.php',
@@ -5392,6 +5393,7 @@
     'PhabricatorMetaMTAMailBodyTestCase' => 'PhabricatorTestCase',
     'PhabricatorMetaMTAMailTestCase' => 'PhabricatorTestCase',
     'PhabricatorMetaMTAMailableDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
+    'PhabricatorMetaMTAMailableFunctionDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'PhabricatorMetaMTAMailgunReceiveController' => 'PhabricatorMetaMTAController',
     'PhabricatorMetaMTAMailingList' => array(
       'PhabricatorMetaMTADAO',
diff --git a/src/applications/metamta/typeahead/PhabricatorMetaMTAMailableFunctionDatasource.php b/src/applications/metamta/typeahead/PhabricatorMetaMTAMailableFunctionDatasource.php
new file mode 100644
--- /dev/null
+++ b/src/applications/metamta/typeahead/PhabricatorMetaMTAMailableFunctionDatasource.php
@@ -0,0 +1,28 @@
+<?php
+
+final class PhabricatorMetaMTAMailableFunctionDatasource
+  extends PhabricatorTypeaheadCompositeDatasource {
+
+  public function getBrowseTitle() {
+    return pht('Browse Subscribers');
+  }
+
+  public function getPlaceholderText() {
+    return pht('Type a username, project, mailing list, or function...');
+  }
+
+  public function getDatasourceApplicationClass() {
+    return 'PhabricatorMetaMTAApplication';
+  }
+
+  public function getComponentDatasources() {
+    return array(
+      new PhabricatorViewerDatasource(),
+      new PhabricatorPeopleDatasource(),
+      new PhabricatorProjectMembersDatasource(),
+      new PhabricatorProjectDatasource(),
+      new PhabricatorMailingListDatasource(),
+    );
+  }
+
+}
diff --git a/src/applications/search/query/PhabricatorSearchApplicationSearchEngine.php b/src/applications/search/query/PhabricatorSearchApplicationSearchEngine.php
--- a/src/applications/search/query/PhabricatorSearchApplicationSearchEngine.php
+++ b/src/applications/search/query/PhabricatorSearchApplicationSearchEngine.php
@@ -32,7 +32,7 @@
 
     $saved->setParameter(
       'subscriberPHIDs',
-      $this->readPHIDsFromRequest($request, 'subscriberPHIDs'));
+      $this->readSubscribersFromRequest($request, 'subscriberPHIDs'));
 
     $saved->setParameter(
       'projectPHIDs',
@@ -68,6 +68,14 @@
     $author_phids = $datasource->evaluateTokens($author_phids);
     $config->setParameter('authorPHIDs', $author_phids);
 
+
+    $datasource = id(new PhabricatorMetaMTAMailableFunctionDatasource())
+      ->setViewer($viewer);
+    $subscriber_phids = $config->getParameter('subscriberPHIDs', array());
+    $subscriber_phids = $datasource->evaluateTokens($subscriber_phids);
+    $config->setParameter('subscriberPHIDs', $subscriber_phids);
+
+
     $query->withSavedQuery($config);
 
     return $query;
@@ -146,7 +154,7 @@
         id(new AphrontFormTokenizerControl())
           ->setName('subscriberPHIDs')
           ->setLabel('Subscribers')
-          ->setDatasource(new PhabricatorMetaMTAMailableDatasource())
+          ->setDatasource(new PhabricatorMetaMTAMailableFunctionDatasource())
           ->setValue($subscriber_phids))
       ->appendControl(
         id(new AphrontFormTokenizerControl())