According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), Send-Box is the email service provider (ESP) for 119 domains — 0.02% of 617,244 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Send-Box is a Russian-focused email service provider that operates primarily in the .ru market, serving smaller organisations and regional deployments. It is most commonly encountered as part of email infrastructure in Russian and Eastern European markets, often appearing alongside Mail.ru for Business within the broader regional email ecosystem.
For senders and mail infrastructure operators, Send-Box's concentrated footprint in regional markets means it rarely poses the high-volume sender reputation challenges of mainstream global providers. However, when targeting or receiving mail involving Russian or Eastern European users, understanding Send-Box's presence in SPF records and routing paths becomes relevant to sender authentication validation and infrastructure planning.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.8% |
| Top 100,000 | 20 | 16.8% |
| Top 1,000,000 | 90 | 75.6% |
| Unranked | 8 | 6.7% |
| TLD | Domains | Share | |
|---|---|---|---|
| .ru | 87 | 73.1% | |
| .com | 11 | 9.2% | |
| .kz | 8 | 6.7% | |
| .net | 2 | 1.7% | |
| .site | 1 | 0.8% | |
| .fm | 1 | 0.8% | |
| .info | 1 | 0.8% | |
| .online | 1 | 0.8% | |
| .by | 1 | 0.8% | |
| .pro | 1 | 0.8% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 119 domains.
| Type | Service | Domains | Share of Send-Box users |
|---|---|---|---|
| Mailbox | Mail.ru for Business | 44 | 37.0% |
| Mailbox | Self-Hosted | 27 | 22.7% |
| Mailbox | Yandex 360 | 26 | 21.8% |
| Mailbox | Google Workspace | 7 | 5.9% |
| Mailbox | Unknown / Other | 4 | 3.4% |
| Mailbox | Generic / unmatched (mx*.*) | 3 | 2.5% |
| ESP | Unisender (RU) | 34 | 28.6% |
| ESP | SMTP.BZ | 15 | 12.6% |
| ESP | SendPulse | 13 | 10.9% |
| ESP | DashaMail (RU) | 9 | 7.6% |
Send-Box appears in detection datasets primarily through SPF include mechanisms, indicating it serves as a delegated mail routing component for its users. When an organisation includes Send-Box in their SPF record alongside other regional providers, each include requires DNS lookups during mail server authentication checks. This multi-provider stacking, particularly common in Eastern European deployments, means DMARC and SPF validators must account for multiple possible sender pathways and handle authentication results from several routing layers.
See the full Send-Box data page (KPI cards, trend, sample domains) →
Send-Box is a Russian-focused email service provider that appears as an SPF include for regional organisations. It is primarily concentrated in smaller-scale deployments in the .ru market rather than global enterprise infrastructure.
119 domains in the Tranco top-1M use Send-Box as their email service provider (ESP) as of July 12, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Send-Box accounts for 0.02% 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.
Send-Box's largest TLD is .ru (73.1% of its domains); it appears across 15 TLDs in total.