Kagoya (JP) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 7, 2026), Kagoya (JP) is the mailbox provider for 592 domains — 0.09% of 666,076 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 592 domains in the Tranco top-1M use Kagoya (JP) (0.09% of domains with MX records).
- Snapshot date: 2026-09-07 — recomputed every day.
- Strongest TLD: .com (33.8% of its domains).
- Region skew: Japan.
- Most co-used service: Kagoya (JP, sender).
- Directory category: hosting mail bundle.
Why Kagoya (JP) appears in this category
Long-running Japanese hosting.
We classify it as a hosting mail bundle from primary MX record (lowest preference) 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 and web hosting infrastructure provider operating primarily from Japan. It serves smaller to mid-market websites, many of which use it both for receiving email and as the source of outbound mail.
As a primary MX record for the long tail of smaller websites, Kagoya is relevant for senders engaging with Asian markets or smaller business domains. Its global spread across diverse top-level domains—particularly .com—combined with regional strength in Japan, makes it a practical testing consideration for anyone whose mail targets these segments.
Where Kagoya (JP) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.2% |
| Top 100,000 | 38 | 6.4% |
| Top 1,000,000 | 552 | 93.2% |
| Unranked | 1 | 0.2% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 200 | 33.8% | |
| .jp | 186 | 31.4% | |
| .co.jp | 105 | 17.7% | |
| .net | 44 | 7.4% | |
| .or.jp | 15 | 2.5% | |
| .ne.jp | 10 | 1.7% | |
| .info | 8 | 1.4% | |
| .biz | 4 | 0.7% | |
| .club | 3 | 0.5% | |
| .tv | 3 | 0.5% |
What Kagoya (JP) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 592 domains.
| Type | Service | Domains | Share of Kagoya (JP) users |
|---|---|---|---|
| ESP | Kagoya (JP, sender) | 510 | 86.1% |
| ESP | BizMatrix | 40 | 6.8% |
| ESP | Amazon SES | 35 | 5.9% |
| ESP | SendGrid (Twilio) | 14 | 2.4% |
| ESP | FSI Email Security | 13 | 2.2% |
| ESP | Repica WebCAS | 10 | 1.7% |
| ESP | Zendesk | 9 | 1.5% |
| ESP | Q-Send | 5 | 0.8% |
| ESP | HubSpot | 5 | 0.8% |
| ESP | Brevo (ex-Sendinblue) | 4 | 0.7% |
Testing strategy for smaller regional providers
Smaller providers like Kagoya often operate with less centralised reputation infrastructure than the handful of mega-providers dominating inbox placement. This means reputation signals—sender authentication, subscriber engagement, complaint handling—may not propagate or persist identically. For senders, this creates a testing blind spot: ignoring regional or smaller-scale MX providers can mask deliverability issues that surface only once mail reaches these platforms. Testing against a representative sample including providers like Kagoya is particularly important if your audience skews toward Asia-Pacific regions or smaller business domains rather than enterprise.
See the full Kagoya (JP) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test my emails against Kagoya?
If your recipient base includes sites on Japanese hosting or smaller regional providers, or if you send significantly to Asia-Pacific markets, testing against Kagoya is worthwhile. For mail destined primarily to large enterprise domains, it is a lower priority.
How many domains use Kagoya (JP)?
592 domains in the Tranco top-1M use Kagoya (JP) as their mailbox provider as of September 7, 2026 (0.09% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Kagoya (JP) common enough to affect email deliverability testing?
Kagoya (JP) accounts for 0.09% 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.
Which countries or TLDs use Kagoya (JP) most?
Kagoya (JP)'s largest TLD is .com (33.8% of its domains); it appears across 23 TLDs in total.