diff --git a/install.sh b/install.sh
index 1822a3b..a566baa 100755
--- a/install.sh
+++ b/install.sh
@@ -101,6 +101,12 @@ info "Richte PostgreSQL ein..."
 systemctl enable postgresql --quiet
 systemctl start postgresql
 
+# Falls config.yml schon existiert, DB-Passwort daraus lesen (verhindert Passwort-Mismatch bei Re-Install)
+if [ -f "$CONFIG_DIR/config.yml" ]; then
+    EXISTING_PW=$(grep -A5 '^database:' "$CONFIG_DIR/config.yml" | awk '/password:/{print $2}' | head -1)
+    [[ -n "$EXISTING_PW" ]] && DB_PASSWORD="$EXISTING_PW" && info "DB-Passwort aus vorhandener config.yml übernommen"
+fi
+
 su -c "psql -tc \"SELECT 1 FROM pg_roles WHERE rolname='archivmail'\" | grep -q 1 \
     && psql -c \"ALTER USER archivmail WITH PASSWORD '$DB_PASSWORD'\" \
     || psql -c \"CREATE USER archivmail WITH PASSWORD '$DB_PASSWORD'\"" postgres