Sophos Email (US) email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 18, 2026), Sophos Email (US) is the email service provider (ESP) for 176 domains — 0.03% of 637,944 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 176 domains in the Tranco top-1M use Sophos Email (US) (0.03% of SPF-publishing domains).
- Snapshot date: 2026-09-18 — recomputed every day.
- Strongest TLD: .com (54.0% of its domains).
- Most co-used service: Sophos Email.
- Directory category: email security gateway.
Why Sophos Email (US) appears in this category
Sophos Email — Hydra cloud gateway, US west region.
We classify it as a email security gateway 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.
Sophos Email (US) is an email service platform offered by Sophos for routing, processing, and delivering outbound mail. It functions as a mail infrastructure component for organisations seeking to manage their email sending.
The platform's footprint is concentrated among smaller organisations using .com domains rather than the largest global brands. It is discovered in email infrastructure through SPF include mechanisms, making it a routine reference point in sender reputation research and authentication audits. For deliverability professionals, Sophos Email (US) represents a steady but long-tail choice within the broader ESP ecosystem.
Where Sophos Email (US) 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 | 9.7% |
| Top 1,000,000 | 155 | 88.1% |
| Unranked | 4 | 2.3% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 95 | 54.0% | |
| .org | 29 | 16.5% | |
| .gov | 6 | 3.4% | |
| .ca | 6 | 3.4% | |
| .com.au | 5 | 2.8% | |
| .edu | 3 | 1.7% | |
| .co.uk | 3 | 1.7% | |
| .com.pe | 2 | 1.1% | |
| .mx | 2 | 1.1% | |
| .co.nz | 2 | 1.1% |
What Sophos Email (US) users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 176 domains.
| Type | Service | Domains | Share of Sophos Email (US) users |
|---|---|---|---|
| Mailbox | Sophos Email | 102 | 58.0% |
| Mailbox | Microsoft 365 | 56 | 31.8% |
| Mailbox | Google Workspace | 7 | 4.0% |
| Mailbox | Mimecast | 4 | 2.3% |
| Mailbox | Self-Hosted | 2 | 1.1% |
| Mailbox | Proofpoint | 1 | 0.6% |
| ESP | SendGrid (Twilio) | 33 | 18.8% |
| ESP | HubSpot | 22 | 12.5% |
| ESP | Amazon SES | 18 | 10.2% |
| ESP | Salesforce | 17 | 9.7% |
Co-deployment patterns with Sophos Email infrastructure
Sophos Email (US) most commonly appears in configurations where the broader Sophos Email platform is also deployed, indicating organisations treat Sophos as an integrated solution for email management. This pattern is most prevalent among .com domains and smaller business deployments, reflecting reliance on bundled email infrastructure within Sophos's product suite. When auditing email infrastructure or evaluating sender reputation, recognising Sophos Email as a cohesive ecosystem rather than isolated components aids in accurately mapping organisational email architecture.
See the full Sophos Email (US) data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Sophos Email (US) and why does it appear in email infrastructure?
Sophos Email (US) is an email service provider operated by Sophos that handles mail routing and delivery for organisations. It appears in infrastructure because organisations use it to send email, which is authorised via SPF records.
How many domains use Sophos Email (US)?
176 domains in the Tranco top-1M use Sophos Email (US) as their email service provider (ESP) as of September 18, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Sophos Email (US) common enough to affect email deliverability testing?
Sophos Email (US) accounts for 0.03% 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 Sophos Email (US) most?
Sophos Email (US)'s largest TLD is .com (54.0% of its domains); it appears across 29 TLDs in total.