According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Microsoft 365 US Government is the mailbox provider for 481 domains — 0.07% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
78.0% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .com at 93.6% of its domains — a strong concentration across 12 TLDs overall. The service most often seen alongside it is Microsoft 365 US Gov (ESP), on 94.6% of its domains.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.2% |
| Top 100,000 | 17 | 3.5% |
| Top 1,000,000 | 375 | 78.0% |
| Unranked | 88 | 18.3% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 450 | 93.6% | |
| .us | 7 | 1.5% | |
| .gov | 6 | 1.2% | |
| .org | 6 | 1.2% | |
| .mil | 5 | 1.0% | |
| .aero | 1 | 0.2% | |
| .net | 1 | 0.2% | |
| .dev | 1 | 0.2% | |
| .ca | 1 | 0.2% | |
| .space | 1 | 0.2% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 481 domains.
| Type | Service | Domains | Share of Microsoft 365 US Government users |
|---|---|---|---|
| ESP | Microsoft 365 US Gov | 455 | 94.6% |
| ESP | Salesforce | 14 | 2.9% |
| ESP | Amazon SES | 13 | 2.7% |
| ESP | HubSpot | 9 | 1.9% |
| ESP | Mailgun | 8 | 1.7% |
| ESP | SendGrid (Twilio) | 6 | 1.2% |
| ESP | Proofpoint | 6 | 1.2% |
| ESP | Zendesk | 5 | 1.0% |
| ESP | Mailchimp | 5 | 1.0% |
| ESP | Salesforce Marketing Cloud | 3 | 0.6% |
See the full Microsoft 365 US Government data page (KPI cards, trend, sample domains) →
481 domains in the Tranco top-1M use Microsoft 365 US Government as their mailbox provider as of July 13, 2026 (0.07% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Microsoft 365 US Government accounts for 0.07% of domains with MX records in the top 1M. Whether you should seed a test mailbox there depends on how much of your audience it represents — the co-usage table above shows the services it appears alongside most.
Microsoft 365 US Government's largest TLD is .com (93.6% of its domains); it appears across 12 TLDs in total.