According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Sophos Email is the mailbox provider for 840 domains — 0.13% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
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.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.1% |
| Top 10,000 | 4 | 0.5% |
| Top 100,000 | 69 | 8.2% |
| Top 1,000,000 | 687 | 81.8% |
| Unranked | 79 | 9.4% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 315 | 37.5% | |
| .de | 129 | 15.4% | |
| .org | 62 | 7.4% | |
| .it | 60 | 7.1% | |
| .gov.uk | 24 | 2.9% | |
| .co.uk | 22 | 2.6% | |
| .net | 19 | 2.3% | |
| .eu | 16 | 1.9% | |
| .com.au | 12 | 1.4% | |
| .cl | 12 | 1.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 840 domains.
| Type | Service | Domains | Share of Sophos Email users |
|---|---|---|---|
| ESP | Sophos Email (EU) | 296 | 35.2% |
| ESP | Sophos Email | 191 | 22.7% |
| ESP | Sophos Email (US) | 106 | 12.6% |
| ESP | SendGrid (Twilio) | 65 | 7.7% |
| ESP | Amazon SES | 62 | 7.4% |
| ESP | Salesforce | 55 | 6.5% |
| ESP | Mailgun | 46 | 5.5% |
| ESP | Zendesk | 44 | 5.2% |
| ESP | HubSpot | 43 | 5.1% |
| ESP | Constant Contact | 41 | 4.9% |
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) →
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.
840 domains in the Tranco top-1M use Sophos Email as their mailbox provider as of July 13, 2026 (0.13% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
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.
Sophos Email's largest TLD is .com (37.5% of its domains); it appears across 73 TLDs in total.