curl --request GET \
  --url https://api.stack-auth.com/api/v1/emails/delivery-info

{
  "stats": {
    "hour": {
      "sent": 123,
      "bounced": 123,
      "marked_as_spam": 123
    },
    "day": {
      "sent": 123,
      "bounced": 123,
      "marked_as_spam": 123
    },
    "week": {
      "sent": 123,
      "bounced": 123,
      "marked_as_spam": 123
    },
    "month": {
      "sent": 123,
      "bounced": 123,
      "marked_as_spam": 123
    }
  },
  "capacity": {
    "rate_per_second": 123,
    "boost_multiplier": 123,
    "penalty_factor": 123,
    "is_boost_active": true,
    "boost_expires_at": "<string>"
  }
}