Email retention

.env.example

@@ -12,6 +12,15 @@ NEXTAUTH_SECRET=CHANGE_ME
 NEXT_PUBLIC_APP_URL=http://localhost:3000
 GOOGLE_CLIENT_ID=
 GOOGLE_CLIENT_SECRET=
-REDIS_URL=redis://redis:6379
-IP_SALT=CHANGE_ME_SALT
-ENABLE_DEMO=true
+REDIS_URL=redis://redis:6379
+IP_SALT=CHANGE_ME_SALT
+ENABLE_DEMO=true
+
+# SMTP (for welcome + retention emails via nodemailer)
+SMTP_HOST=smtp.qrmaster.net
+SMTP_PORT=465
+SMTP_USER=timo@qrmaster.net
+SMTP_PASS=
+
+# Cron job protection — generate with: openssl rand -base64 32
+CRON_SECRET=