Q-Send email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), Q-Send is the email service provider (ESP) for 368 domains — 0.06% of 637,420 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 368 domains in the Tranco top-1M use Q-Send (0.06% of SPF-publishing domains).
- Snapshot date: 2026-09-24 — recomputed every day.
- Strongest TLD: .jp (33.2% of its domains).
- Most co-used service: FSI (JP ISP).
- Directory category: email service provider.
Why Q-Send appears in this category
Q-Send — Japanese email delivery service.
We classify it as a email service 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.
Q-Send is an email service provider offering email campaign and delivery services to customer websites. It is identifiable in customer domain infrastructure through SPF authentication records that list Q-Send as an include.
Q-Send's customer base concentrates in the long tail of smaller and mid-market websites rather than the largest global brands, with particularly strong presence in Japanese-language sites and .jp domains, where it frequently appears alongside FSI, a Japanese ISP. This regional and market-segment concentration means senders targeting Japan or Asia-Pacific regions should include Q-Send in their email authentication audits and reputation monitoring.
Where Q-Send sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.3% |
| Top 100,000 | 26 | 7.1% |
| Top 1,000,000 | 341 | 92.7% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .jp | 122 | 33.2% | |
| .com | 122 | 33.2% | |
| .co.jp | 100 | 27.2% | |
| .net | 13 | 3.5% | |
| .shop | 5 | 1.4% | |
| .ne.jp | 2 | 0.5% | |
| .kyoto | 1 | 0.3% | |
| .tw | 1 | 0.3% | |
| .coop | 1 | 0.3% | |
| .link | 1 | 0.3% |
What Q-Send users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 368 domains.
| Type | Service | Domains | Share of Q-Send users |
|---|---|---|---|
| Mailbox | FSI (JP ISP) | 115 | 31.2% |
| Mailbox | Google Workspace | 51 | 13.9% |
| Mailbox | Self-Hosted | 46 | 12.5% |
| Mailbox | Microsoft 365 | 45 | 12.2% |
| Mailbox | Unknown / Other | 42 | 11.4% |
| Mailbox | SecureMX (JP) | 13 | 3.5% |
| ESP | FSI Email Security | 160 | 43.5% |
| ESP | Amazon SES | 83 | 22.6% |
| ESP | Repica WebCAS | 30 | 8.2% |
| ESP | Cybermail | 15 | 4.1% |
Q-Send and Japanese email infrastructure
Q-Send's prominence in .jp domains and frequent co-occurrence with FSI indicates its role in Japanese email delivery infrastructure. Senders targeting Japanese recipients or testing against Japanese mailbox providers should verify that their SPF records correctly reference Q-Send and monitor how recipient ISPs treat Q-Send traffic in their filtering and reputation systems.
See the full Q-Send data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
Should I test my email deliverability through Q-Send?
If you send email to Japanese recipients, include Q-Send in your deliverability testing, as it is prevalent in Japanese email infrastructure. For non-Japan targeting, test Q-Send only if your own sending infrastructure uses it.
How many domains use Q-Send?
368 domains in the Tranco top-1M use Q-Send as their email service provider (ESP) as of September 24, 2026 (0.06% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Q-Send common enough to affect email deliverability testing?
Q-Send accounts for 0.06% 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 Q-Send most?
Q-Send's largest TLD is .jp (33.2% of its domains); it appears across 10 TLDs in total.