Index: modules/private-stub/hiera/hosts/abpforum1.yaml
===================================================================
--- a/modules/private-stub/hiera/hosts/abpforum1.yaml
+++ b/modules/private-stub/hiera/hosts/abpforum1.yaml
@@ -10,6 +10,7 @@
     admins:
       - 'test1@adblockplus.org'
       - 'test2@adblockplus.org'
+    smtp_host: "172.17.0.1"
     # Google OAuth2 credentials (only valid for https://forum-test.adblockplus.org)
     google_oauth2_client_id: '698709125406-3jodbnl429ie9r00gv4j3ve1olg02sv7.apps.googleusercontent.com'
     google_oauth2_client_secret: 'tB2ESr1b99qJpbOYqv3PtuPU'