diff --git a/src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php b/src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
index 0890ac3004..cfe6491fe0 100644
--- a/src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
+++ b/src/applications/metamta/adapter/PhabricatorMailImplementationMailgunAdapter.php
@@ -86,7 +86,7 @@ final class PhabricatorMailImplementationMailgunAdapter
 
     $from = idx($this->params, 'from');
     if (idx($this->params, 'from-name')) {
-      $params['from'] = "{$this->params['from-name']} <{$from}>";
+      $params['from'] = "\"{$this->params['from-name']}\" <{$from}>";
     } else {
       $params['from'] = $from;
     }