Kagoya (JP, sender) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Kagoya (JP, sender) is the email service provider (ESP) for 726 domains — 0.11% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 726 domains in the Tranco top-1M use Kagoya (JP, sender) (0.11% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (34.3% of its domains).
- Most co-used service: Kagoya (JP).
- Directory category: mailbox provider.
Why Kagoya (JP, sender) appears in this category
Kagoya Japan rental hosting outbound (kagoya.net).
We classify it as a mailbox provider 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.
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.
Where Kagoya (JP, sender) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.1% |
| Top 100,000 | 42 | 5.8% |
| Top 1,000,000 | 677 | 93.3% |
| Unranked | 6 | 0.8% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 249 | 34.3% | |
| .jp | 213 | 29.3% | |
| .co.jp | 138 | 19.0% | |
| .net | 48 | 6.6% | |
| .or.jp | 27 | 3.7% | |
| .info | 9 | 1.2% | |
| .ne.jp | 7 | 1.0% | |
| .org | 4 | 0.6% | |
| .biz | 4 | 0.6% | |
| .tv | 4 | 0.6% |
What Kagoya (JP, sender) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 726 domains.
| Type | Service | Domains | Share of Kagoya (JP, sender) users |
|---|---|---|---|
| Mailbox | Kagoya (JP) | 515 | 70.9% |
| Mailbox | Self-Hosted | 106 | 14.6% |
| Mailbox | Google Workspace | 35 | 4.8% |
| Mailbox | Microsoft 365 | 29 | 4.0% |
| Mailbox | Unknown / Other | 16 | 2.2% |
| Mailbox | Secure.ne.jp (JP) | 4 | 0.6% |
| ESP | Amazon SES | 61 | 8.4% |
| ESP | BizMatrix | 48 | 6.6% |
| ESP | Repica WebCAS | 19 | 2.6% |
| ESP | SendGrid (Twilio) | 15 | 2.1% |
SPF authentication and sender delegation
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) →
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Frequently asked questions
Why might I see Kagoya in a domain's SPF record?
Kagoya is a Japanese email service provider; it appears in SPF records when a domain outsources email sending to Kagoya's relay infrastructure.
How many domains use Kagoya (JP, sender)?
726 domains in the Tranco top-1M use Kagoya (JP, sender) as their email service provider (ESP) as of September 14, 2026 (0.11% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Kagoya (JP, sender) common enough to affect email deliverability testing?
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.
Which countries or TLDs use Kagoya (JP, sender) most?
Kagoya (JP, sender)'s largest TLD is .com (34.3% of its domains); it appears across 28 TLDs in total.