According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Kagoya (JP, sender) is the email service provider (ESP) for 698 domains — 0.11% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Kagoya is a Japanese email service provider and commercial sender that operates relay infrastructure used by organisations to outsource email delivery. Organisations integrate Kagoya into their sending domains via SPF include mechanisms, which delegate sending authority to Kagoya's systems.
The presence of Kagoya SPF includes across a geographically dispersed but predominantly smaller-scale sender base—rather than concentrated among the largest global brands—indicates it serves mid-market and smaller organisations. For anyone reviewing sender reputation or mail flow, encountering Kagoya in an SPF record is a straightforward indicator of email outsourcing to third-party relay infrastructure.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.1% |
| Top 100,000 | 38 | 5.4% |
| Top 1,000,000 | 586 | 84.0% |
| Unranked | 73 | 10.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 245 | 35.1% | |
| .jp | 207 | 29.7% | |
| .co.jp | 130 | 18.6% | |
| .net | 41 | 5.9% | |
| .or.jp | 27 | 3.9% | |
| .info | 9 | 1.3% | |
| .ne.jp | 7 | 1.0% | |
| .biz | 4 | 0.6% | |
| .org | 4 | 0.6% | |
| .tv | 3 | 0.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 698 domains.
| Type | Service | Domains | Share of Kagoya (JP, sender) users |
|---|---|---|---|
| Mailbox | Kagoya (JP) | 509 | 72.9% |
| Mailbox | Self-Hosted | 91 | 13.0% |
| Mailbox | Google Workspace | 35 | 5.0% |
| Mailbox | Microsoft 365 | 25 | 3.6% |
| Mailbox | Unknown / Other | 14 | 2.0% |
| Mailbox | Generic / unmatched (mx*.*) | 3 | 0.4% |
| ESP | Amazon SES | 52 | 7.4% |
| ESP | BizMatrix | 47 | 6.7% |
| ESP | Repica WebCAS | 23 | 3.3% |
| ESP | FSI Email Security | 15 | 2.1% |
Kagoya integrates into sending domains primarily through SPF include records, the standard pattern for commercial email service providers distributing sending load across shared relay systems. This authentication method is neither anomalous nor a deliverability risk; it simply signals that a domain has chosen to delegate email sending to Kagoya's infrastructure rather than operate first-party systems.
See the full Kagoya (JP, sender) data page (KPI cards, trend, sample domains) →
Kagoya is a Japanese email service provider; it appears in SPF records when a domain outsources email sending to Kagoya's relay infrastructure.
698 domains in the Tranco top-1M use Kagoya (JP, sender) as their email service provider (ESP) as of July 13, 2026 (0.11% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Kagoya (JP, sender) accounts for 0.11% 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.
Kagoya (JP, sender)'s largest TLD is .com (35.1% of its domains); it appears across 28 TLDs in total.