Surface: Authentication API · application/problem+json Type URI: https://docs.zeroset.com/problems/mail_delivery_unavailable Code: mail_delivery_unavailable HTTP status: 503

The operation depends on outbound mail, which is currently unavailable.

Resolving it

Retry later. No link was delivered, so the previous link — if any — remains the current one.

Response shape

{
  "type": "https://docs.zeroset.com/problems/mail_delivery_unavailable",
  "title": "Mail delivery unavailable",
  "status": 503,
  "code": "mail_delivery_unavailable",
  "detail": "a human-readable explanation"
}

Every field is required. Clients must reject an authentication problem whose type is not exactly the expansion shown above — the Nebula SDKs do.