According to Live Direct Marketing's daily Tranco top-1M scan (September 5, 2026), Box is the SaaS sender for 333 domains — 0.05% of 633,359 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Box — US enterprise cloud content management and file-sharing platform sending share and collaboration notifications.
We classify it as a SaaS sender from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Box is a SaaS platform that enables organisations to send email on behalf of their domains. Its presence in email infrastructure is discovered through SPF (Sender Policy Framework) include mechanisms, which authorise Box's mail servers to send on a domain's behalf.
Box occupies a particular position in the email provider landscape: it is most prevalent amongst smaller and mid-sized organisations rather than the largest enterprise brands, spread across multiple countries and top-level domains with a strong presence in .com. It is frequently encountered alongside Google Workspace in organisational email configurations, indicating it serves as an email platform choice for teams using that productivity suite.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 3 | 0.9% |
| Top 100,000 | 40 | 12.0% |
| Top 1,000,000 | 287 | 86.2% |
| Unranked | 3 | 0.9% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 141 | 42.3% | |
| .co.jp | 27 | 8.1% | |
| .com.mx | 13 | 3.9% | |
| .mx | 12 | 3.6% | |
| .net | 11 | 3.3% | |
| .org | 11 | 3.3% | |
| .fr | 9 | 2.7% | |
| .io | 7 | 2.1% | |
| .com.br | 5 | 1.5% | |
| .jp | 4 | 1.2% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 333 domains.
| Type | Service | Domains | Share of Box users |
|---|---|---|---|
| Mailbox | Google Workspace | 107 | 32.1% |
| Mailbox | Microsoft 365 | 62 | 18.6% |
| Mailbox | Runbox | 56 | 16.8% |
| Mailbox | Self-Hosted | 51 | 15.3% |
| Mailbox | Unknown / Other | 14 | 4.2% |
| Mailbox | Generic / unmatched (mx*.*) | 7 | 2.1% |
Organisations using Box must include a reference to Box's mail servers in their SPF record—typically via an include mechanism—to authenticate email sent through the platform. This SPF entry tells receiving mail servers that mail from that domain via Box's infrastructure is authorised. Because Box appears in SPF records across a distributed range of smaller domains rather than concentrated amongst the largest global brands, its infrastructure represents an important authentication touchpoint for a specific segment of the email sender ecosystem.
See the full Box data page (KPI cards, trend, sample domains) →
It means your domain is configured to send email via Box's platform. The SPF entry authorises Box to send mail on your behalf; if you do not recognise this configuration, it may indicate misconfiguration or unauthorised email sending.
333 domains in the Tranco top-1M use Box as their SaaS sender as of September 5, 2026 (0.05% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Box accounts for 0.05% 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.
Box's largest TLD is .com (42.3% of its domains); it appears across 76 TLDs in total.