Name the recipient in a header that headers-only complaint reports keep

Shipped

September 13, 2026 at 6:25 PM UTC

Author

Kamo

Commit

430369b

Microsoft's feedback-loop reports now carry only the original message's headers, with anything shaped like an address masked. Every campaign message carries X-Kamo-FBL (the recipient's token, the one List-Unsubscribe already has), and the complaint parser reads it first.