UniOne email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 12, 2026), UniOne is the email service provider (ESP) for 310 domains — 0.05% of 629,828 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 310 domains in the Tranco top-1M use UniOne (0.05% of SPF-publishing domains).
- Snapshot date: 2026-09-12 — recomputed every day.
- Strongest TLD: .ru (42.3% of its domains).
- Most co-used service: Yandex 360.
- Directory category: email service provider.
Why UniOne appears in this category
UniOne (UniSender) — Russian transactional email API.
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.
UniOne is a Russian email service provider serving transactional and marketing email delivery for smaller to mid-sized websites. It sits within the broader Yandex email infrastructure ecosystem and is primarily used by regional operators rather than global enterprises.
Its presence in SPF include records across the top-1M web indicates adoption concentrated in the long tail of smaller sites, predominantly across Russian-speaking markets and .ru domains, frequently deployed alongside Yandex 360. This pattern signals a regional authentication and routing choice rather than a globally distributed platform, with direct deliverability relevance mainly to senders targeting or hosted in Russian and Eastern European zones.
Where UniOne sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 7 | 2.3% |
| Top 100,000 | 42 | 13.5% |
| Top 1,000,000 | 261 | 84.2% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .ru | 131 | 42.3% | |
| .com | 63 | 20.3% | |
| .ua | 21 | 6.8% | |
| .com.ua | 8 | 2.6% | |
| .org | 8 | 2.6% | |
| .by | 7 | 2.3% | |
| .online | 5 | 1.6% | |
| .io | 5 | 1.6% | |
| .net | 5 | 1.6% | |
| .kz | 5 | 1.6% |
What UniOne users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 310 domains.
| Type | Service | Domains | Share of UniOne users |
|---|---|---|---|
| Mailbox | Yandex 360 | 75 | 24.2% |
| Mailbox | Self-Hosted | 67 | 21.6% |
| Mailbox | Google Workspace | 66 | 21.3% |
| Mailbox | Mail.ru for Business | 26 | 8.4% |
| Mailbox | Microsoft 365 | 17 | 5.5% |
| Mailbox | Generic / unmatched (mail.*) | 10 | 3.2% |
| ESP | Unisender (RU) | 113 | 36.5% |
| ESP | UniSender | 56 | 18.1% |
| ESP | SendPulse | 22 | 7.1% |
| ESP | Elastic Email | 18 | 5.8% |
SPF authentication and Yandex infrastructure coupling
UniOne's SPF include mechanisms are typically embedded within Yandex's broader mail infrastructure, meaning adoption of UniOne often couples a sender's authentication stack to that regional system. For senders dispatching email to Russian-speaking recipients, understanding UniOne's reputation and SPF footprint is relevant to authentication audit and endpoint recognition; for operations outside these geographic zones, it remains a peripheral infrastructure detail.
See the full UniOne data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email deliverability against UniOne if my audience is global?
UniOne's relevance to deliverability testing depends on your recipient geography. If you send primarily to Russian-speaking or .ru-domain subscribers, understanding UniOne's authentication and routing is important; for global or non-Eastern-European audiences, it remains a secondary consideration.
How many domains use UniOne?
310 domains in the Tranco top-1M use UniOne as their email service provider (ESP) as of September 12, 2026 (0.05% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is UniOne common enough to affect email deliverability testing?
UniOne accounts for 0.05% 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 UniOne most?
UniOne's largest TLD is .ru (42.3% of its domains); it appears across 50 TLDs in total.