Sendios email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 20, 2026), Sendios is the email service provider (ESP) for 102 domains — 0.02% of 638,158 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 102 domains in the Tranco top-1M use Sendios (0.02% of SPF-publishing domains).
- Snapshot date: 2026-09-20 — recomputed every day.
- Strongest TLD: .com (99.0% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Sendios appears in this category
Lifecycle and transactional email 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.
What the data shows
77.5% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .com at 99.0% of its domains — a strong concentration across 2 TLDs overall. The service most often seen alongside it is Google Workspace (mailbox provider), on 100.0% of its domains.
Where Sendios 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 | 23 | 22.5% |
| Top 1,000,000 | 79 | 77.5% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 101 | 99.0% | |
| .live | 1 | 1.0% |
What Sendios users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 102 domains.
| Type | Service | Domains | Share of Sendios users |
|---|---|---|---|
| Mailbox | Google Workspace | 102 | 100.0% |
| ESP | Zendesk | 101 | 99.0% |
See the full Sendios data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
How many domains use Sendios?
102 domains in the Tranco top-1M use Sendios as their email service provider (ESP) as of September 20, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Sendios common enough to affect email deliverability testing?
Sendios 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.
Which countries or TLDs use Sendios most?
Sendios's largest TLD is .com (99.0% of its domains); it appears across 2 TLDs in total.