According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Microsoft 365 US Gov is the email service provider (ESP) for 514 domains — 0.08% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Microsoft 365 US Gov is Microsoft's cloud productivity platform tailored for United States government agencies and their contractors. It is operated by Microsoft and provides hosted email, collaboration, and office services under compliance frameworks specific to federal and state government requirements.
In email authentication data, Microsoft 365 US Gov SPF configurations appear predominantly among smaller-scale websites and commercial entities in the .com domain space, often alongside unidentified or mixed infrastructure. This pattern reflects its role as a supporting service for government-aligned commercial operations rather than a mainstream public-facing email platform.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 2 | 0.4% |
| Top 100,000 | 26 | 5.1% |
| Top 1,000,000 | 398 | 77.4% |
| Unranked | 88 | 17.1% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 474 | 92.2% | |
| .org | 9 | 1.8% | |
| .us | 8 | 1.6% | |
| .gov | 7 | 1.4% | |
| .mil | 4 | 0.8% | |
| .net | 2 | 0.4% | |
| .edu | 2 | 0.4% | |
| .com.br | 2 | 0.4% | |
| .aero | 1 | 0.2% | |
| .dev | 1 | 0.2% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 514 domains.
| Type | Service | Domains | Share of Microsoft 365 US Gov users |
|---|---|---|---|
| Mailbox | Microsoft 365 US Government | 455 | 88.5% |
| Mailbox | Unknown / Other | 26 | 5.1% |
| Mailbox | Self-Hosted | 8 | 1.6% |
| Mailbox | Proofpoint | 6 | 1.2% |
| Mailbox | Google Workspace | 6 | 1.2% |
| Mailbox | Microsoft 365 | 5 | 1.0% |
| ESP | Salesforce | 27 | 5.3% |
| ESP | Proofpoint | 26 | 5.1% |
| ESP | Amazon SES | 21 | 4.1% |
| ESP | HubSpot | 14 | 2.7% |
When Microsoft 365 US Gov appears in email authentication records alongside unidentified infrastructure, the deployment often reflects hybrid government-contractor networks where email originates from mixed sources. Senders targeting these recipients should verify that SPF includes for Microsoft 365 US Gov are properly qualified and that DKIM signing policies align with both commercial and government compliance frameworks.
See the full Microsoft 365 US Gov data page (KPI cards, trend, sample domains) →
Microsoft 365 US Gov is Microsoft's government-exclusive cloud platform for United States agencies and contractors. It affects email only if you send to or receive from government organisations using it; mainstream commercial senders typically do not encounter it as a primary recipient platform.
514 domains in the Tranco top-1M use Microsoft 365 US Gov as their email service provider (ESP) as of July 13, 2026 (0.08% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Microsoft 365 US Gov accounts for 0.08% of SPF-publishing domains 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 Gov's largest TLD is .com (92.2% of its domains); it appears across 14 TLDs in total.