diff --git a/config/sync/maillog.settings.yml b/config/devel/maillog.settings.yml
similarity index 100%
rename from config/sync/maillog.settings.yml
rename to config/devel/maillog.settings.yml
diff --git a/config/sync/config_split.config_split.devel.yml b/config/sync/config_split.config_split.devel.yml
index 632ad632..1f038230 100644
--- a/config/sync/config_split.config_split.devel.yml
+++ b/config/sync/config_split.config_split.devel.yml
@@ -19,6 +19,7 @@ module:
   webprofiler: 0
 theme: {  }
 blacklist:
+  - maillog.settings
   - system.menu.devel
 graylist: {  }
 graylist_dependents: true