Theeml (RU-CENTER) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 17, 2026), Theeml (RU-CENTER) is the email service provider (ESP) for 50 domains — 0.01% of 635,547 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 50 domains in the Tranco top-1M use Theeml (RU-CENTER) (0.01% of SPF-publishing domains).
- Snapshot date: 2026-09-17 — recomputed every day.
- Strongest TLD: .ru (68.0% of its domains).
- Most co-used service: Yandex 360.
- Directory category: email service provider.
Why Theeml (RU-CENTER) appears in this category
Theeml — RU-CENTER 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.
Theeml is an email service provider operated by RU-CENTER, serving smaller and mid-market organisations primarily in the Russian domain space with mail hosting and sending infrastructure.
Theeml's presence in smaller sites' SPF records reflects its positioning as a regional ESP rather than a major global platform. Its frequent pairing with Yandex 360 in sender authentication records suggests these platforms are chosen together by organisations operating in Russian and post-Soviet markets; for email practitioners, this means Theeml's sender reputation is shaped by a narrower, regionally concentrated base than international ESPs.
Where Theeml (RU-CENTER) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 9 | 18.0% |
| Top 1,000,000 | 41 | 82.0% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .ru | 34 | 68.0% | |
| .com | 8 | 16.0% | |
| .academy | 1 | 2.0% | |
| .com.ua | 1 | 2.0% | |
| .org | 1 | 2.0% | |
| .ua | 1 | 2.0% | |
| .expert | 1 | 2.0% | |
| .place | 1 | 2.0% | |
| .run | 1 | 2.0% | |
| .tv | 1 | 2.0% |
What Theeml (RU-CENTER) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 50 domains.
| Type | Service | Domains | Share of Theeml (RU-CENTER) users |
|---|---|---|---|
| Mailbox | Yandex 360 | 17 | 34.0% |
| Mailbox | Self-Hosted | 11 | 22.0% |
| Mailbox | Mail.ru for Business | 9 | 18.0% |
| Mailbox | Google Workspace | 5 | 10.0% |
| Mailbox | Generic / unmatched (mx*.*) | 4 | 8.0% |
| Mailbox | Generic / unmatched (mail.*) | 2 | 4.0% |
| ESP | Unisender (RU) | 44 | 88.0% |
| ESP | Mailgun | 4 | 8.0% |
| ESP | Mailchimp | 3 | 6.0% |
| ESP | SendPulse | 3 | 6.0% |
SPF Footprint and Regional Market Concentration
Theeml's visibility through SPF include mechanisms reflects its concentration among smaller, regional organisations rather than enterprise or consumer-facing brands. The prevalence of Theeml alongside Yandex 360 in the same SPF records indicates these platforms are often chosen together by organisations targeting or operating within Russian-speaking markets. From a deliverability perspective, this clustering means Theeml's sender reputation is shaped by a narrower, more geographically and linguistically specific sender base than global ESPs, which can make inbox placement more predictable for regional mailers but less relevant for campaigns aimed elsewhere.
See the full Theeml (RU-CENTER) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Theeml and who operates it?
Theeml is an email service provider operated by RU-CENTER, focused on mail hosting and sending infrastructure for smaller organisations, particularly in the Russian domain space. It frequently appears alongside Yandex 360 in sender authentication records.
How many domains use Theeml (RU-CENTER)?
50 domains in the Tranco top-1M use Theeml (RU-CENTER) as their email service provider (ESP) as of September 17, 2026 (0.01% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Theeml (RU-CENTER) common enough to affect email deliverability testing?
Theeml (RU-CENTER) accounts for 0.01% 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 Theeml (RU-CENTER) most?
Theeml (RU-CENTER)'s largest TLD is .ru (68.0% of its domains); it appears across 10 TLDs in total.