SecureMX (JP) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), SecureMX (JP) is the mailbox provider for 594 domains — 0.09% of 665,310 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 594 domains in the Tranco top-1M use SecureMX (JP) (0.09% of domains with MX records).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .co.jp (53.4% of its domains).
- Region skew: Japan.
- Most co-used service: SecureMX.
- Directory category: email security gateway.
Why SecureMX (JP) appears in this category
Japan anti-spam inbound gateway (Internet Initiative Japan).
We classify it as a email security gateway 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.
SecureMX (JP) is a mailbox provider serving the Japanese email ecosystem, with primary concentration in the .co.jp domain namespace. It handles mail exchange for a distributed cluster of mid-market Japanese websites.
Since SecureMX (JP) concentrates regionally within Japan's business domain space rather than hosting the largest brands, senders and administrators targeting Japanese recipients should recognise it as a significant infrastructure point where delivery patterns and reputation handling may diverge from global-scale providers. For campaigns into Japan, understanding its regional footprint is material to testing and reputation planning.
Where SecureMX (JP) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 7 | 1.2% |
| Top 100,000 | 98 | 16.5% |
| Top 1,000,000 | 489 | 82.3% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .co.jp | 317 | 53.4% | |
| .jp | 129 | 21.7% | |
| .com | 81 | 13.6% | |
| .or.jp | 31 | 5.2% | |
| .ac.jp | 8 | 1.3% | |
| .ne.jp | 8 | 1.3% | |
| .net | 7 | 1.2% | |
| .org | 3 | 0.5% | |
| .co.id | 3 | 0.5% | |
| .com.au | 1 | 0.2% |
What SecureMX (JP) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 594 domains.
| Type | Service | Domains | Share of SecureMX (JP) users |
|---|---|---|---|
| ESP | SecureMX | 490 | 82.5% |
| ESP | Amazon SES | 87 | 14.6% |
| ESP | Salesforce | 56 | 9.4% |
| ESP | Repica WebCAS | 41 | 6.9% |
| ESP | CrmStyle | 26 | 4.4% |
| ESP | Cuenote | 26 | 4.4% |
| ESP | Zendesk | 22 | 3.7% |
| ESP | BizMatrix | 21 | 3.5% |
| ESP | Tricorn | 19 | 3.2% |
| ESP | HubSpot | 16 | 2.7% |
Regional infrastructure and recipient clustering
SecureMX (JP) hosts a distinct cluster of mid-market domains in the .co.jp space, meaning senders with significant Japanese recipient bases are likely to encounter it frequently. When testing email deliverability to Japanese recipients, sampling domains hosted on SecureMX (JP) can expose delivery or reputation issues specific to that regional infrastructure, rather than relying solely on tests against Japan's largest brands.
See the full SecureMX (JP) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is SecureMX (JP) and should I test against it?
SecureMX (JP) is a mailbox provider concentrated in Japan's .co.jp domain ecosystem. If your campaigns target Japanese recipients, including SecureMX (JP)-hosted domains in your deliverability testing is advisable to identify any region-specific delivery challenges.
How many domains use SecureMX (JP)?
594 domains in the Tranco top-1M use SecureMX (JP) as their mailbox provider as of September 12, 2026 (0.09% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is SecureMX (JP) common enough to affect email deliverability testing?
SecureMX (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 SecureMX (JP) most?
SecureMX (JP)'s largest TLD is .co.jp (53.4% of its domains); it appears across 16 TLDs in total.