diff --git a/config/default.yaml b/config/default.yaml
index f43cbaf4b..b5ad0a8f2 100644
--- a/config/default.yaml
+++ b/config/default.yaml
@@ -1,3 +1,5 @@
+# /!\ YOU SHOULD NOT UPDATE THIS FILE, USE production.yaml instead /!\ #
+
 listen:
   hostname: '127.0.0.1'
   port: 9000
@@ -60,7 +62,7 @@ admin:
 signup:
   enabled: false
   limit: 10 # When the limit is reached, registrations are disabled. -1 == unlimited
-  filters: 
+  filters:
     cidr: # You can specify CIDR ranges to whitelist (empty = no filtering) or blacklist
       whitelist: []
       blacklist: []
diff --git a/config/production.yaml.example b/config/production.yaml.example
index a9d2c3b80..a11f0a1d6 100644
--- a/config/production.yaml.example
+++ b/config/production.yaml.example
@@ -32,10 +32,10 @@ redis:
 # SMTP server to send emails
 smtp:
   hostname: null
-  port: 465
+  port: 465 # If you use StartTLS: 587
   username: null
   password: null
-  tls: true
+  tls: true # If you use StartTLS: false
   disable_starttls: false
   ca_file: null # Used for self signed certificates
   from_address: 'admin@example.com'
@@ -76,7 +76,7 @@ admin:
 signup:
   enabled: false
   limit: 10 # When the limit is reached, registrations are disabled. -1 == unlimited
-  filters: 
+  filters:
     cidr: # You can specify CIDR ranges to whitelist (empty = no filtering) or blacklist
       whitelist: []
       blacklist: []
diff --git a/support/docker/production/docker-compose.yml b/support/docker/production/docker-compose.yml
index 5f8822ad3..32ee75113 100644
--- a/support/docker/production/docker-compose.yml
+++ b/support/docker/production/docker-compose.yml
@@ -32,6 +32,8 @@ services:
       PEERTUBE_SIGNUP_ENABLED: "true"
       PEERTUBE_TRANSCODING_ENABLED: "true"
       PEERTUBE_REDIS_HOSTNAME: redis
+      PEERTUBE_SMTP_USERNAME: null
+      PEERTUBE_SMTP_PASSWORD: null
       PEERTUBE_SMTP_HOSTNAME: null
       PEERTUBE_SMTP_PORT: 25
       PEERTUBE_SMTP_FROM: noreply@peertube.domain.tld