{
  "title": "ReplyLead email-provider research: dated contact-domain snapshots",
  "version": "2026-09-25",
  "source": "https://replylead.com/b2b-email-provider-market-share.html",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "validation": "Recomputed from retained aggregate snapshots; no new DNS scan.",
  "limitations": [
    "Raw database has grown to 12,915,843 rows; not a reproducible historical cohort from current rows. Validation uses retained aggregate snapshots, not a new DNS scan.",
    "August gateway_total includes Cloudflare Email routing; do not describe it as security-only.",
    "July firmographic join and provider snapshot differ in category subtotals; size data remains a separate exploratory artifact, not merged into provider totals.",
    "Counts describe domains, not organizations, seats, mailboxes, email-client opens or delivery outcomes.",
    "Different populations and classifiers prevent treating July-to-August differences as market-share movement."
  ],
  "rows": [
    {
      "dataset_id": "provider-summary-20260828",
      "observation_date": "2026-08-28",
      "population_domains": 9058780,
      "resolved_domains": 10241042,
      "category": "Microsoft 365",
      "domains": 2492673,
      "share_pct": 27.516652,
      "unit": "distinct email domain",
      "scope": "contact-data population; not global market share"
    },
    {
      "dataset_id": "provider-summary-20260828",
      "observation_date": "2026-08-28",
      "population_domains": 9058780,
      "resolved_domains": 10241042,
      "category": "Google Workspace",
      "domains": 2298481,
      "share_pct": 25.372964,
      "unit": "distinct email domain",
      "scope": "contact-data population; not global market share"
    },
    {
      "dataset_id": "provider-summary-20260828",
      "observation_date": "2026-08-28",
      "population_domains": 9058780,
      "resolved_domains": 10241042,
      "category": "Other receiving environments",
      "domains": 4267626,
      "share_pct": 47.110384,
      "unit": "distinct email domain",
      "scope": "contact-data population; not global market share"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Microsoft 365",
      "domains": 2387891,
      "share_pct": 28.479819,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Google Workspace",
      "domains": 2166677,
      "share_pct": 25.841451,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Smaller and regional hosts",
      "domains": 1348835,
      "share_pct": 16.08724,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Self-hosted (own domain)",
      "domains": 1241027,
      "share_pct": 14.80144,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Proofpoint",
      "domains": 307368,
      "share_pct": 3.665906,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Hostinger",
      "domains": 138851,
      "share_pct": 1.656043,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "IONOS / 1&1",
      "domains": 135724,
      "share_pct": 1.618748,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Zoho",
      "domains": 97967,
      "share_pct": 1.16843,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "GoDaddy",
      "domains": 89040,
      "share_pct": 1.061959,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Mimecast",
      "domains": 74566,
      "share_pct": 0.889331,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Barracuda",
      "domains": 72239,
      "share_pct": 0.861578,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Rackspace",
      "domains": 55032,
      "share_pct": 0.656354,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "OVH",
      "domains": 49157,
      "share_pct": 0.586284,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Yahoo / AOL",
      "domains": 45185,
      "share_pct": 0.538911,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Titan",
      "domains": 38198,
      "share_pct": 0.455579,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "cPanel-style host",
      "domains": 27371,
      "share_pct": 0.326448,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Yandex",
      "domains": 16490,
      "share_pct": 0.196672,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Proton",
      "domains": 14770,
      "share_pct": 0.176158,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Cisco / IronPort",
      "domains": 12431,
      "share_pct": 0.148262,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Trend Micro",
      "domains": 11506,
      "share_pct": 0.137229,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Fastmail",
      "domains": 11287,
      "share_pct": 0.134617,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Sophos",
      "domains": 10674,
      "share_pct": 0.127306,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Apple iCloud",
      "domains": 10000,
      "share_pct": 0.119268,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Amazon SES / WorkMail",
      "domains": 7268,
      "share_pct": 0.086684,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Mail.ru",
      "domains": 6656,
      "share_pct": 0.079385,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Symantec / Broadcom",
      "domains": 3081,
      "share_pct": 0.036746,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Hushmail",
      "domains": 2093,
      "share_pct": 0.024963,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Bluehost / Newfold",
      "domains": 1679,
      "share_pct": 0.020025,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Forcepoint",
      "domains": 1428,
      "share_pct": 0.017031,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    },
    {
      "dataset_id": "provider-detail-20260719",
      "observation_date": "2026-07-19",
      "population_domains": 8384502,
      "resolved_domains": 9847723,
      "category": "Fortinet",
      "domains": 11,
      "share_pct": 0.000131,
      "unit": "distinct email domain",
      "scope": "contact-data population; ordered historical classifier"
    }
  ],
  "august_intermediaries": {
    "observation_date": "2026-08-28",
    "population_domains": 9058780,
    "label": "Identified gateways and routing intermediaries; not security-only",
    "domains": 584271,
    "categories": {
      "Proofpoint": {
        "domains": 315119,
        "share_pct": 3.4786030790018083
      },
      "Mimecast": {
        "domains": 76217,
        "share_pct": 0.8413605364077723
      },
      "Barracuda": {
        "domains": 71633,
        "share_pct": 0.7907576958486684
      },
      "Cisco / IronPort": {
        "domains": 12177,
        "share_pct": 0.13442207449568264
      },
      "Sophos": {
        "domains": 11196,
        "share_pct": 0.12359280167969638
      },
      "Trend Micro": {
        "domains": 11979,
        "share_pct": 0.13223634970713496
      },
      "Forcepoint": {
        "domains": 1316,
        "share_pct": 0.014527342533983604
      },
      "Fortinet": {
        "domains": 3411,
        "share_pct": 0.03765407703907148
      },
      "Symantec / Broadcom": {
        "domains": 3247,
        "share_pct": 0.03584367872936532
      },
      "SpamTitan / TitanHQ": {
        "domains": 8230,
        "share_pct": 0.0908510859078154
      },
      "Hornetsecurity": {
        "domains": 21664,
        "share_pct": 0.23914920110655077
      },
      "Cloudflare Email": {
        "domains": 46924,
        "share_pct": 0.5179946968576342
      },
      "MailRoute": {
        "domains": 1158,
        "share_pct": 0.012783178308778887
      }
    }
  },
  "company_size_exploration": {
    "observation_date": "2026-07-19",
    "aggregate_generated": "2026-08-12T09:40:13Z",
    "population_domains": 8384502,
    "status": "Separate exploratory join; category totals differ from provider-detail snapshot. Do not combine or infer campaign outcomes.",
    "bands": [
      {
        "band": "1-10",
        "domains": 4061509,
        "gateway": 216523,
        "microsoft": 1174043,
        "google": 1143074,
        "self_hosted": 527243,
        "gateway_pct": 5.33,
        "microsoft_pct": 28.91,
        "google_pct": 28.14,
        "self_hosted_pct": 12.98
      },
      {
        "band": "11-50",
        "domains": 1150584,
        "gateway": 90799,
        "microsoft": 430519,
        "google": 308006,
        "self_hosted": 104933,
        "gateway_pct": 7.89,
        "microsoft_pct": 37.42,
        "google_pct": 26.77,
        "self_hosted_pct": 9.12
      },
      {
        "band": "51-250",
        "domains": 605526,
        "gateway": 80362,
        "microsoft": 257072,
        "google": 133264,
        "self_hosted": 41747,
        "gateway_pct": 13.27,
        "microsoft_pct": 42.45,
        "google_pct": 22.01,
        "self_hosted_pct": 6.89
      },
      {
        "band": "251-1000",
        "domains": 173891,
        "gateway": 31406,
        "microsoft": 70776,
        "google": 31114,
        "self_hosted": 13431,
        "gateway_pct": 18.06,
        "microsoft_pct": 40.7,
        "google_pct": 17.89,
        "self_hosted_pct": 7.72
      },
      {
        "band": "1000+",
        "domains": 100297,
        "gateway": 15799,
        "microsoft": 34916,
        "google": 18823,
        "self_hosted": 9013,
        "gateway_pct": 15.75,
        "microsoft_pct": 34.81,
        "google_pct": 18.77,
        "self_hosted_pct": 8.99
      },
      {
        "band": "unclassified",
        "domains": 2292695,
        "gateway": 58030,
        "microsoft": 415520,
        "google": 532251,
        "self_hosted": 546376,
        "gateway_pct": 2.53,
        "microsoft_pct": 18.12,
        "google_pct": 23.22,
        "self_hosted_pct": 23.83
      }
    ]
  }
}