Cuenote email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), Cuenote is the email service provider (ESP) for 481 domains — 0.08% of 629,828 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 481 domains in the Tranco top-1M use Cuenote (0.08% of SPF-publishing domains).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .com (36.8% of its domains).
- Most co-used service: Microsoft 365.
- Directory category: email service provider.
Why Cuenote appears in this category
Cuenote (Toban) — Japanese email marketing platform.
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.
Cuenote is an email service provider whose SPF configuration is prevalent across the internet's smaller and medium-tier websites rather than the largest global brands. Its presence spans internationally across multiple country-code and generic domains, with .com as the dominant top-level domain.
The frequent co-occurrence of Cuenote SPF includes alongside Microsoft 365 authentication suggests a shared deployment pattern. For deliverability professionals evaluating email authentication chains across diverse sender populations, recognising Cuenote in SPF records is important: when it appears alongside Microsoft 365 or other providers, DNS query-limit constraints and potential qualifier conflicts require careful review to ensure proper alignment.
Where Cuenote sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 2 | 0.4% |
| Top 10,000 | 6 | 1.2% |
| Top 100,000 | 80 | 16.6% |
| Top 1,000,000 | 391 | 81.3% |
| Unranked | 2 | 0.4% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 177 | 36.8% | |
| .co.jp | 90 | 18.7% | |
| .jp | 79 | 16.4% | |
| .de | 31 | 6.4% | |
| .or.jp | 20 | 4.2% | |
| .org | 9 | 1.9% | |
| .co.uk | 9 | 1.9% | |
| .net | 6 | 1.2% | |
| .ac.jp | 5 | 1.0% | |
| .hu | 4 | 0.8% |
What Cuenote users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 481 domains.
| Type | Service | Domains | Share of Cuenote users |
|---|---|---|---|
| Mailbox | Microsoft 365 | 188 | 39.1% |
| Mailbox | Google Workspace | 66 | 13.7% |
| Mailbox | Self-Hosted | 63 | 13.1% |
| Mailbox | Unknown / Other | 42 | 8.7% |
| Mailbox | SecureMX (JP) | 26 | 5.4% |
| Mailbox | Mimecast | 15 | 3.1% |
| ESP | Amazon SES | 126 | 26.2% |
| ESP | Salesforce | 46 | 9.6% |
| ESP | HubSpot | 44 | 9.1% |
| ESP | Zendesk | 30 | 6.2% |
SPF configuration alongside Microsoft 365
Cuenote SPF includes frequently appear in authentication stacks that also include Microsoft 365, reflecting a common pattern in which organisations use both services. When both sit in the same SPF record, the combined length and nesting can approach DNS query limits, and conflicting qualifier chains may cause unexpected softfail or fail results at receivers that enforce strict alignment rules.
See the full Cuenote data page (KPI cards, trend, sample domains) →
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Frequently asked questions
I see Cuenote in a sender's SPF record — what does that mean?
Cuenote is an email service provider used by smaller to mid-market organisations; its presence in SPF indicates that sender is using it for email delivery. When seen alongside Microsoft 365, verify that both authentication mechanisms align correctly.
How many domains use Cuenote?
481 domains in the Tranco top-1M use Cuenote as their email service provider (ESP) as of September 12, 2026 (0.08% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Cuenote common enough to affect email deliverability testing?
Cuenote accounts for 0.08% 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 Cuenote most?
Cuenote's largest TLD is .com (36.8% of its domains); it appears across 47 TLDs in total.