diff --git a/support/docker/production/.env b/support/docker/production/.env
index 1f0a8c63b..9edc183b6 100644
--- a/support/docker/production/.env
+++ b/support/docker/production/.env
@@ -9,6 +9,7 @@ PEERTUBE_SMTP_HOSTNAME=
 PEERTUBE_SMTP_PORT=25
 PEERTUBE_SMTP_FROM=noreply@domain.tld
 PEERTUBE_SMTP_TLS=true
+PEERTUBE_SMTP_DISABLE_STARTTLS=false
 PEERTUBE_ADMIN_EMAIL=admin@domain.tld
 # /!\ Prefer to use the PeerTube admin interface to set the following configurations /!\
 #PEERTUBE_SIGNUP_ENABLED=true
diff --git a/support/docker/production/docker-compose.yml b/support/docker/production/docker-compose.yml
index c8b89d5a2..71e0ac6f7 100644
--- a/support/docker/production/docker-compose.yml
+++ b/support/docker/production/docker-compose.yml
@@ -35,6 +35,7 @@ services:
       PEERTUBE_SMTP_PORT: ${PEERTUBE_SMTP_PORT}
       PEERTUBE_SMTP_FROM: ${PEERTUBE_SMTP_FROM}
       PEERTUBE_SMTP_TLS: ${PEERTUBE_SMTP_TLS}
+      PEERTUBE_SMTP_DISABLE_STARTTLS: ${PEERTUBE_SMTP_DISABLE_STARTTLS}
       PEERTUBE_ADMIN_EMAIL: ${PEERTUBE_ADMIN_EMAIL}
       # /!\ Prefer to use the PeerTube admin interface to set the following configurations /!\
       # PEERTUBE_SIGNUP_ENABLED: ${PEERTUBE_SIGNUP_ENABLED}