OpenSRS (Tucows) mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), OpenSRS (Tucows) is the mailbox provider for 1,676 domains — 0.25% of 675,489 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 1,676 domains in the Tranco top-1M use OpenSRS (Tucows) (0.25% of domains with MX records).
- Snapshot date: 2026-09-24 — recomputed every day.
- Strongest TLD: .com (65.9% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Wild West Domains Forwarder.
- Directory category: mailbox provider.
Why OpenSRS (Tucows) appears in this category
Tucows wholesale mail platform for resellers.
We classify it as a mailbox provider from primary MX record (lowest preference) 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
92.7% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .com at 65.9% of its domains — a strong concentration across 94 TLDs overall. The service most often seen alongside it is Wild West Domains Forwarder (ESP), on 5.4% of its domains.
Where OpenSRS (Tucows) sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 7 | 0.4% |
| Top 100,000 | 70 | 4.2% |
| Top 1,000,000 | 1,554 | 92.7% |
| Unranked | 44 | 2.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,105 | 65.9% | |
| .net | 113 | 6.7% | |
| .org | 80 | 4.8% | |
| .shop | 34 | 2.0% | |
| .ca | 32 | 1.9% | |
| .store | 28 | 1.7% | |
| .co.uk | 23 | 1.4% | |
| .fr | 22 | 1.3% | |
| .in | 18 | 1.1% | |
| .io | 14 | 0.8% |
What OpenSRS (Tucows) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 1,676 domains.
| Type | Service | Domains | Share of OpenSRS (Tucows) users |
|---|---|---|---|
| ESP | Wild West Domains Forwarder | 90 | 5.4% |
| ESP | Amazon SES | 57 | 3.4% |
| ESP | Mailgun | 49 | 2.9% |
| ESP | Zendesk | 22 | 1.3% |
| ESP | Mailchimp | 21 | 1.3% |
| ESP | SendGrid (Twilio) | 20 | 1.2% |
| ESP | MailerLite | 20 | 1.2% |
| ESP | Mandrill | 18 | 1.1% |
| ESP | HubSpot | 9 | 0.5% |
| ESP | Campaign Monitor | 9 | 0.5% |
See the full OpenSRS (Tucows) 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 OpenSRS (Tucows)?
1,676 domains in the Tranco top-1M use OpenSRS (Tucows) as their mailbox provider as of September 24, 2026 (0.25% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is OpenSRS (Tucows) common enough to affect email deliverability testing?
OpenSRS (Tucows) accounts for 0.25% of domains with MX records 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 OpenSRS (Tucows) most?
OpenSRS (Tucows)'s largest TLD is .com (65.9% of its domains); it appears across 94 TLDs in total.