diff --git a/docs/reverse.rst b/docs/reverse.rst
index f2826890..a55f865e 100644
--- a/docs/reverse.rst
+++ b/docs/reverse.rst
@@ -176,20 +176,21 @@ One such example is ``mailu/traefik-certdumper``, which has been adapted for use
     # !!! Also don’t forget to add "TRAEFIK_DOMAIN=[...]" to your .env!
       - DOMAIN=$TRAEFIK_DOMAIN
     volumes:
+      # Folder, which contains the acme.json
       - "/data/traefik:/traefik"
-      - "$ROOT/certs:/output"
+      # Folder, where cert.pem and key.pem will be written
+      - "/data/mailu/certs:/output"
 
 
-
-Assuming you have ``volume-mounted`` your ``acme.json`` put to ``/data/traefik`` on your host. The dumper will then write out ``/data/traefik/ssl/your.doma.in.crt``
-and ``/data/traefik/ssl/your.doma.in.key`` whenever ``acme.json`` is updated. Yay! Now let’s mount this to our ``front`` container like:
+Assuming you have ``volume-mounted`` your ``acme.json`` put to ``/data/traefik`` on your host. The dumper will then write out ``/data/mailu/certs/cert.pem`` and ``/data/mailu/certs/key.pem`` whenever ``acme.json`` is updated.
+Yay! Now let’s mount this to our ``front`` container like:
 
 .. code-block:: yaml
 
     volumes:
-      - "$ROOT/overrides/nginx:/overrides"
-      - /data/traefik/ssl/$TRAEFIK_DOMAIN.crt:/certs/cert.pem
-      - /data/traefik/ssl/$TRAEFIK_DOMAIN.key:/certs/key.pem
+      - /data/mailu/certs:/certs
+
+This works, because we set ``TLS_FLAVOR=mail``, which picks up the key-certificate pair (e.g., ``cert.pem`` and ``key.pem``) from the certs folder in the root path (``/certs/``).
 
 .. _`Traefik`: https://traefik.io/
 
diff --git a/optional/traefik-certdumper/run.sh b/optional/traefik-certdumper/run.sh
index eeb45ac0..2880d44f 100755
--- a/optional/traefik-certdumper/run.sh
+++ b/optional/traefik-certdumper/run.sh
@@ -5,8 +5,10 @@ function dump() {
 
     traefik-certs-dumper file --crt-name "cert" --crt-ext ".pem" --key-name "key" --key-ext ".pem" --domain-subdir --dest /tmp/work --source /traefik/acme.json > /dev/null
 
-    if diff -q /tmp/work/${DOMAIN}/cert.pem /output/cert.pem >/dev/null && \
-	    diff -q /tmp/work/${DOMAIN}/key.pem /output/key.pem >/dev/null ; then
+    if [[ -f /tmp/work/${DOMAIN}/cert.pem && -f /tmp/work/${DOMAIN}/key.pem && -f /output/cert.pem && -f /output/key.pem ]] && \
+	diff -q /tmp/work/${DOMAIN}/cert.pem /output/cert.pem >/dev/null && \
+	diff -q /tmp/work/${DOMAIN}/key.pem /output/key.pem >/dev/null ; \
+    then
 	echo "$(date) Certificate and key still up to date, doing nothing"
     else
 	echo "$(date) Certificate or key differ, updating"