Sophos Email mailbox provider
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), Sophos Email is the mailbox provider for 882 domains — 0.13% of 674,487 domains with MX records. Detection method: primary MX record (lowest preference).
Key facts
- 882 domains in the Tranco top-1M use Sophos Email (0.13% of domains with MX records).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (37.2% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Sophos Email (EU).
- Directory category: email security gateway.
Why Sophos Email appears in this category
Sophos Email (Reflexion-based) anti-spam gateway.
We classify it as a email security gateway 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.
Sophos Email is an email security and filtering platform operated by Sophos, a security company offering gateway and cloud-based email protection. It sits between organisations and their mail infrastructure, applying threat detection, content filtering, and archival.
Sophos Email's footprint spans smaller and mid-market organisations globally, particularly across .com and other generic domains, with significant presence in the US and Europe. For senders, this means a non-negligible share of business inboxes run through Sophos's filtering layer, making its configuration and filtering posture relevant to anyone testing deliverability across a broad recipient base.
Where Sophos Email sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 4 | 0.5% |
| Top 100,000 | 70 | 7.9% |
| Top 1,000,000 | 801 | 90.8% |
| Unranked | 6 | 0.7% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 328 | 37.2% | |
| .de | 139 | 15.8% | |
| .it | 63 | 7.1% | |
| .org | 59 | 6.7% | |
| .gov.uk | 22 | 2.5% | |
| .co.uk | 22 | 2.5% | |
| .net | 20 | 2.3% | |
| .ca | 15 | 1.7% | |
| .eu | 15 | 1.7% | |
| .at | 13 | 1.5% |
What Sophos Email users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 882 domains.
| Type | Service | Domains | Share of Sophos Email users |
|---|---|---|---|
| ESP | Sophos Email (EU) | 311 | 35.3% |
| ESP | Sophos Email | 201 | 22.8% |
| ESP | Sophos Email (US) | 104 | 11.8% |
| ESP | SendGrid (Twilio) | 65 | 7.4% |
| ESP | Amazon SES | 63 | 7.1% |
| ESP | Salesforce | 54 | 6.1% |
| ESP | Mailgun | 47 | 5.3% |
| ESP | HubSpot | 45 | 5.1% |
| ESP | Zendesk | 43 | 4.9% |
| ESP | Mailchimp | 42 | 4.8% |
Sophos Email filtering and authentication in distributed deployments
Because Sophos Email serves primarily smaller organisations across diverse regions and geographies, the organisations using it often configure their email stacks with variable authentication (SPF, DKIM, DMARC) coverage and filtering policies. This heterogeneity means deliverability testing against Sophos Email can surface authentication or filtering edge cases that larger monolithic providers would not. The platform's focus on security—scanning attachments, detecting phishing patterns, and applying reputation filtering—also means that mail passing technical authentication may still face delays or rejection if Sophos flags it as suspicious, making reputation and content quality as important as technical correctness.
See the full Sophos Email data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test email delivery specifically against Sophos Email?
If your target audience includes small to mid-market businesses, particularly in the US and Europe, testing against Sophos Email is worthwhile; it represents a common filtering layer for that segment. Many deliverability issues discovered via Sophos Email stem from authentication gaps or content patterns, so testing can identify problems before they affect real campaigns.
How many domains use Sophos Email?
882 domains in the Tranco top-1M use Sophos Email as their mailbox provider as of September 14, 2026 (0.13% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Is Sophos Email common enough to affect email deliverability testing?
Sophos Email accounts for 0.13% 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 Sophos Email most?
Sophos Email's largest TLD is .com (37.2% of its domains); it appears across 73 TLDs in total.