According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Tricorn is the email service provider (ESP) for 188 domains — 0.03% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Tricorn is an email service provider that operates email infrastructure for websites worldwide. Its presence is announced through SPF include mechanisms, which publish its authorised IP address ranges in the Domain Name System records of its customer organisations.
For email practitioners, Tricorn's footprint across smaller organisations and regional markets—particularly in Japanese domains—has direct deliverability implications. Because Tricorn frequently appears alongside Microsoft 365, email administrators must account for its shared IP reputation when evaluating sender authentication and assessing recipient filtering rules.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 13 | 6.9% |
| Top 100,000 | 38 | 20.2% |
| Top 1,000,000 | 133 | 70.7% |
| Unranked | 4 | 2.1% |
| TLD | Domains | Share | |
|---|---|---|---|
| .jp | 64 | 34.0% | |
| .co.jp | 59 | 31.4% | |
| .com | 39 | 20.7% | |
| .net | 10 | 5.3% | |
| .ac.jp | 7 | 3.7% | |
| .or.jp | 6 | 3.2% | |
| .org | 2 | 1.1% | |
| .ne.jp | 1 | 0.5% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 188 domains.
| Type | Service | Domains | Share of Tricorn users |
|---|---|---|---|
| Mailbox | Google Workspace | 32 | 17.0% |
| Mailbox | Microsoft 365 | 31 | 16.5% |
| Mailbox | Self-Hosted | 26 | 13.8% |
| Mailbox | Unknown / Other | 25 | 13.3% |
| Mailbox | SecureMX (JP) | 19 | 10.1% |
| Mailbox | Generic / unmatched (mx*.*) | 14 | 7.4% |
| ESP | Amazon SES | 39 | 20.7% |
| ESP | Salesforce | 28 | 14.9% |
| ESP | SecureMX | 19 | 10.1% |
| ESP | CrmStyle | 10 | 5.3% |
When Tricorn appears in a domain's SPF record, it authorises Tricorn's IP addresses to send email on that domain's behalf. Email administrators assessing sender reputation must evaluate Tricorn's shared IP pool reputation, not merely the customer organisation's reputation alone—a material distinction because Tricorn operates shared infrastructure across many smaller sites.
See the full Tricorn data page (KPI cards, trend, sample domains) →
Test against Tricorn if you send through it or if you monitor email from Japanese and other regional markets where Tricorn is prevalent. For senders using other major ESPs, Tricorn testing is not usually critical, but understanding its infrastructure role helps with comprehensive deliverability assessment.
188 domains in the Tranco top-1M use Tricorn as their email service provider (ESP) as of July 13, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Tricorn accounts for 0.03% 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.
Tricorn's largest TLD is .jp (34.0% of its domains); it appears across 8 TLDs in total.