Upload emailer.py

emailer.py

@@ -106,7 +106,10 @@ def _send_via_resend(recipients: list, subject: str, content: str) -> str:
     req = urllib.request.Request(
         "https://api.resend.com/emails", data=payload, method="POST",
         headers={"Authorization": f"Bearer {RESEND_API_KEY}",
-                 "Content-Type": "application/json"})
+                 "Content-Type": "application/json",
+                 # Resend/Cloudflare reject requests with no User-Agent
+                 # (403, error code 1010) before they reach the API.
+                 "User-Agent": "chan-compass/1.0 (+https://huggingface.co/spaces)"})
     try:
         with urllib.request.urlopen(req, timeout=30) as resp:
             body = resp.read().decode("utf-8", "ignore")