diff --git a/config/site_settings.yml b/config/site_settings.yml
index e3176161f8c..e98480c2d35 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -584,7 +584,7 @@ email:
     default: ''
   mailgun_api_key:
     default: ''
-    regex: '^pubkey-\h{32}$'
+    regex: '^key-\h{32}$'
 
 
 files: