diff --git a/conf/.env b/conf/.env
index 1eb1260..e40e636 100644
--- a/conf/.env
+++ b/conf/.env
@@ -40,7 +40,7 @@ EXECUTIONS_DATA_MAX_AGE=168
 EXECUTIONS_DATA_PRUNE_MAX_COUNT=2000
 
 N8N_EMAIL_MODE=smtp
-N8N_SMTP_HOST=localhost
+N8N_SMTP_HOST=__MAIN_DOMAIN__
 N8N_SMTP_PORT=25
 N8N_SMTP_USER=__APP__
 N8N_SMTP_PASS=__MAIL_PWD__
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 49e9b21..d802561 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -9,6 +9,7 @@ nodejs_version=20
 n8n_version=1.9.3
 
 timezone="$(cat /etc/timezone)"
+main_domain=$(cat /etc/yunohost/current_host)
 
 #=================================================
 # PERSONAL HELPERS