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The Docker self-hosting guide listed RESEND_WEBHOOK_SECRET, but no code path reads that name. The email extension reads RESEND_DELIVERY_WEBHOOK_SECRET in extensions/general/email/lib/delivery-webhook.ts, so an operator who follows this guide ends up with a .env that looks correct while isDeliveryWebhookConfigured() returns false and invoice delivery status is silently unavailable. With the secret unread the webhook endpoint answers 503, so Resend retries and eventually disables the endpoint. That is deliberate, but it leaves the operator with no delivery outcomes and no obvious cause. docs/WHITELABEL.md already documents the correct name. Signed-off-by: Bjorn Bergenheim <29535152+bjornbergenheim@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>