diff --git a/templates/rallly/docker-compose.yml b/templates/rallly/docker-compose.yml
index c255346..6189893 100644
--- a/templates/rallly/docker-compose.yml
+++ b/templates/rallly/docker-compose.yml
@@ -29,8 +29,12 @@ services:
       - SMTP_PORT=${SMTP_PORT:-587}
       - SMTP_SECURE=${SMTP_SECURE:-false}
       - SMTP_REJECT_UNAUTHORIZED=${SMTP_REJECT_UNAUTHORIZED:-true}
-      - NOREPLY_EMAIL=${NOREPLY_EMAIL:-}
+      # NOREPLY_EMAIL + SUPPORT_EMAIL are REQUIRED by Rallly at boot (it refuses to start without valid
+      # emails), independent of whether mail can actually send. Default them to valid addresses so Rallly
+      # boots with app-email OFF; the relay overrides NOREPLY_EMAIL to rallly@felhom.eu when ON.
+      - NOREPLY_EMAIL=${NOREPLY_EMAIL:-noreply@${DOMAIN}}
       - NOREPLY_EMAIL_NAME=${NOREPLY_EMAIL_NAME:-Felhom}
+      - SUPPORT_EMAIL=${SUPPORT_EMAIL:-noreply@${DOMAIN}}
     networks:
       - traefik-public
       - rallly-internal