diff --git a/tools/fill_emails_from_contacts.py b/tools/fill_emails_from_contacts.py
new file mode 100644
index 0000000..18bca29
--- /dev/null
+++ b/tools/fill_emails_from_contacts.py
@@ -0,0 +1,91 @@
+"""Complete domain_environments.responsable_email / referent_email depuis contacts.
+
+Match sur le nom (contacts.name ≈ responsable_nom ou referent_nom).
+
+Usage:
+    python tools/fill_emails_from_contacts.py [--dry-run]
+"""
+import os
+import argparse
+import unicodedata
+from sqlalchemy import create_engine, text
+
+DATABASE_URL = os.getenv("DATABASE_URL_DEMO") or os.getenv("DATABASE_URL") \
+    or "postgresql://patchcenter:PatchCenter2026!@localhost:5432/patchcenter_demo"
+
+
+def normalize(s):
+    """Normalise un nom: ASCII lowercase sans accent ni espaces multiples."""
+    if not s:
+        return ""
+    nfkd = unicodedata.normalize("NFKD", s.strip().lower())
+    ascii_str = "".join(c for c in nfkd if not unicodedata.combining(c))
+    return " ".join(ascii_str.split())
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--dry-run", action="store_true")
+    args = parser.parse_args()
+
+    engine = create_engine(DATABASE_URL)
+    print(f"[INFO] DB: {DATABASE_URL.split('@')[-1]}")
+    conn = engine.connect().execution_options(isolation_level="AUTOCOMMIT")
+
+    # Cache contacts: normalized name -> email
+    contacts = conn.execute(text(
+        "SELECT name, email FROM contacts WHERE email IS NOT NULL AND email != ''"
+    )).fetchall()
+    name_to_email = {}
+    for c in contacts:
+        key = normalize(c.name)
+        if key and "no-email" not in (c.email or "").lower():
+            name_to_email[key] = c.email
+    print(f"[INFO] {len(name_to_email)} contacts avec email")
+
+    # Domain_environments a completer
+    rows = conn.execute(text("""
+        SELECT id, responsable_nom, responsable_email, referent_nom, referent_email
+        FROM domain_environments
+        WHERE (responsable_email IS NULL OR responsable_email = '' OR referent_email IS NULL OR referent_email = '')
+    """)).fetchall()
+    print(f"[INFO] {len(rows)} (dom,env) a completer")
+
+    updated = 0
+    unmatched = set()
+    for r in rows:
+        updates = {}
+        if r.responsable_nom and not (r.responsable_email or "").strip():
+            key = normalize(r.responsable_nom)
+            email = name_to_email.get(key)
+            if email:
+                updates["responsable_email"] = email
+            elif key:
+                unmatched.add(r.responsable_nom)
+        if r.referent_nom and not (r.referent_email or "").strip():
+            key = normalize(r.referent_nom)
+            email = name_to_email.get(key)
+            if email:
+                updates["referent_email"] = email
+            elif key:
+                unmatched.add(r.referent_nom)
+
+        if not updates:
+            continue
+        if args.dry_run:
+            print(f"  DRY: de_id={r.id}  {updates}")
+        else:
+            sets = ", ".join(f"{k}=:{k}" for k in updates)
+            params = dict(updates); params["id"] = r.id
+            conn.execute(text(f"UPDATE domain_environments SET {sets} WHERE id=:id"), params)
+        updated += 1
+
+    conn.close()
+    print(f"\n[DONE] Maj: {updated}")
+    if unmatched:
+        print(f"[WARN] Noms sans match dans contacts ({len(unmatched)}) : "
+              f"{sorted(unmatched)[:10]}...")
+
+
+if __name__ == "__main__":
+    main()