{
  "name": "Inbox placement tests on prewarmed infrastructure, monthly",
  "page": "https://warminboxes.com/research/inbox-placement-log",
  "fieldwork": "March to October 2026",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "WarmInboxes.com",
  "generated": "2026-11-05",
  "notes": [
    "inbox + spam = received in every row; received is lower than sent where part of the seed list did not accept the message.",
    "Route percentages carry no volume: the platform reports placement per sender-to-recipient pair without the count down each one. Read routes for direction, monthly totals for magnitude.",
    "A pair the test did not exercise is absent rather than 0."
  ],
  "monthly": [
    {
      "month": "March 2026",
      "sent": 38479,
      "received": 38366,
      "inbox": 38042,
      "spam": 324,
      "inbox_rate_pct": 99.1555
    },
    {
      "month": "April 2026",
      "sent": 67681,
      "received": 66894,
      "inbox": 66353,
      "spam": 541,
      "inbox_rate_pct": 99.1913
    },
    {
      "month": "May 2026",
      "sent": 78907,
      "received": 57195,
      "inbox": 56505,
      "spam": 690,
      "inbox_rate_pct": 98.7936
    },
    {
      "month": "June 2026",
      "sent": 50321,
      "received": 36426,
      "inbox": 32882,
      "spam": 3544,
      "inbox_rate_pct": 90.2707
    },
    {
      "month": "July 2026",
      "sent": 62928,
      "received": 58169,
      "inbox": 51428,
      "spam": 6741,
      "inbox_rate_pct": 88.4114
    },
    {
      "month": "August 2026",
      "sent": 3004,
      "received": 2983,
      "inbox": 2955,
      "spam": 28,
      "inbox_rate_pct": 99.0613
    },
    {
      "month": "September 2026",
      "sent": 78270,
      "received": 73698,
      "inbox": 70376,
      "spam": 3322,
      "inbox_rate_pct": 95.4924
    },
    {
      "month": "October 2026",
      "sent": 135600,
      "received": 135600,
      "inbox": 128100,
      "spam": 7500,
      "inbox_rate_pct": 94.469
    }
  ],
  "routes": [
    {
      "month": "March 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 98.42
    },
    {
      "month": "March 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 99.9
    },
    {
      "month": "March 2026",
      "from": "Google",
      "to": "Other",
      "inbox_pct": 98.39
    },
    {
      "month": "March 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 100
    },
    {
      "month": "March 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 100
    },
    {
      "month": "March 2026",
      "from": "Azure",
      "to": "Other",
      "inbox_pct": 100
    },
    {
      "month": "April 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 98.51
    },
    {
      "month": "April 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 100
    },
    {
      "month": "April 2026",
      "from": "Google",
      "to": "Other",
      "inbox_pct": 98.36
    },
    {
      "month": "April 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 80.92
    },
    {
      "month": "April 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 100
    },
    {
      "month": "April 2026",
      "from": "Azure",
      "to": "Other",
      "inbox_pct": 78.26
    },
    {
      "month": "May 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 96.56
    },
    {
      "month": "May 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 99.91
    },
    {
      "month": "May 2026",
      "from": "Google",
      "to": "Other",
      "inbox_pct": 96.74
    },
    {
      "month": "May 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 95.69
    },
    {
      "month": "May 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 100
    },
    {
      "month": "May 2026",
      "from": "Azure",
      "to": "Other",
      "inbox_pct": 86.67
    },
    {
      "month": "June 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 99.42
    },
    {
      "month": "June 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 99.81
    },
    {
      "month": "June 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 0.49
    },
    {
      "month": "June 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 75.5
    },
    {
      "month": "July 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 93.83
    },
    {
      "month": "July 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 82.24
    },
    {
      "month": "July 2026",
      "from": "Google",
      "to": "Other",
      "inbox_pct": 85.1
    },
    {
      "month": "July 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 0.22
    },
    {
      "month": "July 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 99.8
    },
    {
      "month": "August 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 98.89
    },
    {
      "month": "August 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 99.79
    },
    {
      "month": "August 2026",
      "from": "Google",
      "to": "Other",
      "inbox_pct": 89.74
    },
    {
      "month": "September 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 97.3
    },
    {
      "month": "September 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 92.17
    },
    {
      "month": "September 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 86.35
    },
    {
      "month": "September 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 100
    },
    {
      "month": "October 2026",
      "from": "Google",
      "to": "Google",
      "inbox_pct": 94.34
    },
    {
      "month": "October 2026",
      "from": "Google",
      "to": "Microsoft",
      "inbox_pct": 89.58
    },
    {
      "month": "October 2026",
      "from": "Azure",
      "to": "Google",
      "inbox_pct": 97.99
    },
    {
      "month": "October 2026",
      "from": "Azure",
      "to": "Microsoft",
      "inbox_pct": 98.05
    }
  ]
}