Maileroo email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), Maileroo is the email service provider (ESP) for 129 domains — 0.02% of 637,420 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 129 domains in the Tranco top-1M use Maileroo (0.02% of SPF-publishing domains).
- Snapshot date: 2026-09-24 — recomputed every day.
- Strongest TLD: .com (39.5% of its domains).
- Most co-used service: Generic / unmatched (mx*.*).
- Directory category: email service provider.
Why Maileroo appears in this category
Australian transactional email API and SMTP relay.
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
86.8% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. It spans 51 TLDs, led by .com (39.5%) — a broad, internationally distributed base. The service most often seen alongside it is Generic / unmatched (mx*.*) (mailbox provider), on 26.4% of its domains.
Where Maileroo 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 | 17 | 13.2% |
| Top 1,000,000 | 112 | 86.8% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 51 | 39.5% | |
| .net | 6 | 4.7% | |
| .io | 4 | 3.1% | |
| .com.au | 4 | 3.1% | |
| .co.uk | 4 | 3.1% | |
| .to | 3 | 2.3% | |
| .de | 3 | 2.3% | |
| .nl | 3 | 2.3% | |
| .cx | 2 | 1.6% | |
| .mx | 2 | 1.6% |
What Maileroo users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 129 domains.
| Type | Service | Domains | Share of Maileroo users |
|---|---|---|---|
| Mailbox | Generic / unmatched (mx*.*) | 34 | 26.4% |
| Mailbox | Google Workspace | 19 | 14.7% |
| Mailbox | Self-Hosted | 15 | 11.6% |
| Mailbox | Cloudflare Email Routing | 12 | 9.3% |
| Mailbox | Microsoft 365 | 10 | 7.8% |
| Mailbox | Zoho Mail (EU) | 5 | 3.9% |
| ESP | Cloudflare Email Routing | 14 | 10.9% |
| ESP | Mailjet (Sinch) | 13 | 10.1% |
| ESP | SendGrid (Twilio) | 5 | 3.9% |
| ESP | Zoho Mail EU (sender) | 5 | 3.9% |
See the full Maileroo data page (KPI cards, trend, sample domains) →
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Frequently asked questions
How many domains use Maileroo?
129 domains in the Tranco top-1M use Maileroo as their email service provider (ESP) as of September 24, 2026 (0.02% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Maileroo common enough to affect email deliverability testing?
Maileroo 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 Maileroo most?
Maileroo's largest TLD is .com (39.5% of its domains); it appears across 51 TLDs in total.