diff --git a/.env-exemple b/.env-exemple
index 02b219e5..15a9e5db 100644
--- a/.env-exemple
+++ b/.env-exemple
@@ -6,9 +6,8 @@
 FLASK_APP=scodoc.py
 FLASK_ENV=production # ou "development" si vous développez
 
-# Envois de mails: décommenter et adapter
+# Envois de mails: adapter si nécessaire
 # MAIL_SERVER=localhost
-# MAIL_PORT=25
 
 # Obligatoire: 
 SCODOC_ADMIN_MAIL="emmanuel@viennet.net"
diff --git a/config.py b/config.py
index ced04ffb..a2560325 100755
--- a/config.py
+++ b/config.py
@@ -11,15 +11,13 @@ load_dotenv(os.path.join(BASEDIR, ".env"))
 class Config:
     """General configuration. Mostly loaded from environment via .env"""
 
+    SQLALCHEMY_DATABASE_URI = None  # set in subclass
+    FLASK_ENV = None  # # set in subclass
     SECRET_KEY = os.environ.get("SECRET_KEY") or "90e01e75831e4176a3c70d29564b425f"
-    SQLALCHEMY_DATABASE_URI = (
-        os.environ.get("USERS_DATABASE_URI")
-        or "postgresql://scodoc@localhost:5432/SCO8USERS"
-    )
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     LOG_TO_STDOUT = os.environ.get("LOG_TO_STDOUT")
-    MAIL_SERVER = os.environ.get("MAIL_SERVER")
-    MAIL_PORT = int(os.environ.get("MAIL_PORT") or 25)
+    MAIL_SERVER = os.environ.get("MAIL_SERVER", "localhost")
+    MAIL_PORT = int(os.environ.get("MAIL_PORT", 25))
     MAIL_USE_TLS = os.environ.get("MAIL_USE_TLS") is not None
     MAIL_USERNAME = os.environ.get("MAIL_USERNAME")
     MAIL_PASSWORD = os.environ.get("MAIL_PASSWORD")
diff --git a/tools/configure-scodoc9.sh b/tools/configure-scodoc9.sh
index 2c60d156..f058378d 100755
--- a/tools/configure-scodoc9.sh
+++ b/tools/configure-scodoc9.sh
@@ -88,9 +88,6 @@ then
 FLASK_APP=scodoc.py
 FLASK_ENV=production
 
-MAIL_SERVER=localhost
-MAIL_PORT=25
-
 SCODOC_ADMIN_MAIL="$SCODOC_ADMIN_MAIL" # important: le mail de admin
 SECRET_KEY="$SECRET_KEY" # une chaine aléatoire"