FSI (JP ISP) email provider statistics and deliverability context
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According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), FSI (JP ISP) is the mailbox provider for 256 domains — 0.04% of 665,310 domains with MX records. Its strongest TLD is .jp (47.3% of its domains). Detection: primary MX record (lowest preference).
Last updated from the 2026-09-12 DNS snapshot.
What FSI (JP ISP) represents in this dataset
Japanese ISP mail (fsi.ne.jp).
Directory category: Mailbox. The classification comes from primary MX record (lowest preference). It describes observed DNS infrastructure, not a commercial relationship and not the placement of any individual message.
What the 2026-09-12 snapshot shows about FSI (JP ISP)
Across 8 distinct TLDs its top three are .jp (47.3%), .com (32.4%), .co.jp (9.4%) — together 89.1% of the 256 domains, which makes the footprint narrow — three TLDs cover most of it, which is typical of a regional or single-market operator. The service most often observed on the same domains is FSI Email Security (ESP, 255 domains, 99.6% of them), followed by Q-Send (52.3%). Directly comparable by the same detection rule: Self-Hosted, Google Workspace, Microsoft 365. Ranking between them reflects what is published in DNS, not delivery quality or volume sent. All figures come from a single daily DNS snapshot (2026-09-12); a domain appears here when its published records match the primary MX record (lowest preference) rule, which is an infrastructure fact, not a commercial relationship.
Commonly used together with FSI (JP ISP)
What else the same 256 domains use — cross-tabulated from the same daily snapshot (2026-09-12).
| Type | Service | Domains | Share of FSI (JP ISP) users |
|---|---|---|---|
| ESP | FSI Email Security | 255 | 99.6% |
| ESP | Q-Send | 134 | 52.3% |
| ESP | Repica WebCAS | 11 | 4.3% |
| ESP | Amazon SES | 8 | 3.1% |
| ESP | BizMatrix | 5 | 2.0% |
| ESP | Zendesk | 3 | 1.2% |
| ESP | Tricorn | 2 | 0.8% |
| ESP | HubSpot | 1 | 0.4% |
| ESP | BeSender | 1 | 0.4% |
| ESP | WiLL Mail | 1 | 0.4% |
TLD distribution (top 8 of 8)
Frequently asked questions
How many domains use FSI (JP ISP)?
256 domains in the Tranco top-1M use FSI (JP ISP) as their mailbox provider as of September 12, 2026, according to Live Direct Marketing's daily DNS scan.
What is FSI (JP ISP)'s market share?
FSI (JP ISP) holds 0.04% of domains with MX records in the Tranco top-1M (snapshot of 2026-09-12). The number is recomputed every day.
What are the biggest alternatives to FSI (JP ISP)?
The largest mailbox providers in the same category by Tranco top-1M share are: Self-Hosted, Google Workspace, Microsoft 365, Unknown / Other, Generic / unmatched (mx*.*) (as of 2026-09-12).
Largest mailbox providers in this category
Self-Hosted (22.39%) · Google Workspace (21.66%) · Microsoft 365 (16.96%) · Unknown / Other (6.60%) · Generic / unmatched (mx*.*) (2.54%) · Generic / unmatched (mail.*) (1.94%) · Proofpoint (1.88%) · Cloudflare Email Routing (1.75%) · Yandex 360 (1.61%) · Mimecast (1.46%)
Domain sample (top 100 by Tranco rank)
Showing 100 of 256 domains.