diff --git a/app/main.py b/app/main.py
index 9adb527..6bb6b3b 100644
--- a/app/main.py
+++ b/app/main.py
@@ -482,10 +482,13 @@ async def listmonk_reconcile() -> dict:
                 # Both classes leave the list the same way: unsubscribe, keep the
                 # record. Nothing is deleted.
                 reason = "inactive member" if email in member_emails else "not a member"
+                # listmonk validates the PUT body's email field: omitting it is a
+                # 400 "Invalid email." and the subscriber stays on the list (which
+                # is why the inactive-member branch never actually worked).
                 r = await client.put(
                     f"{LISTMONK_BASE}/api/subscribers/{sid}",
                     headers=auth,
-                    json={"lists": []},
+                    json={"email": s.get("email"), "lists": []},
                 )
                 if r.status_code in (200, 201):
                     removed += 1