According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Sophos Email is the email service provider (ESP) for 304 domains — 0.05% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Sophos Email is the email hosting and security service operated by Sophos, the cybersecurity company. It provides email filtering, archiving, and compliance capabilities, typically deployed by organisations that seek to integrate email security within a broader endpoint and network protection framework.
Its footprint across the Tranco top-1M websites reflects adoption predominantly by smaller and mid-market organisations rather than the largest global brands. The service is geographically distributed with particular concentration across .com domains and a user distribution tilted towards North American markets. For email senders, this means Sophos Email recipients span many sectors and organisation sizes; deliverability teams encounter Sophos filtering policies more frequently from mid-market firms than from large enterprises.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 25 | 8.2% |
| Top 1,000,000 | 244 | 80.3% |
| Unranked | 35 | 11.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 113 | 37.2% | |
| .de | 31 | 10.2% | |
| .org | 24 | 7.9% | |
| .it | 22 | 7.2% | |
| .co.uk | 13 | 4.3% | |
| .cl | 7 | 2.3% | |
| .at | 7 | 2.3% | |
| .ca | 6 | 2.0% | |
| .net | 6 | 2.0% | |
| .edu | 5 | 1.6% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 304 domains.
| Type | Service | Domains | Share of Sophos Email users |
|---|---|---|---|
| Mailbox | Sophos Email | 191 | 62.8% |
| Mailbox | Microsoft 365 | 77 | 25.3% |
| Mailbox | Self-Hosted | 6 | 2.0% |
| Mailbox | Unknown / Other | 6 | 2.0% |
| Mailbox | Proofpoint | 4 | 1.3% |
| Mailbox | Google Workspace | 4 | 1.3% |
| ESP | Mailchimp | 19 | 6.2% |
| ESP | Mandrill | 16 | 5.3% |
| ESP | Zendesk | 15 | 4.9% |
| ESP | SendGrid (Twilio) | 15 | 4.9% |
Sophos Email functions as an inbound mail gateway and filtering layer, operating its own SPF records and processing sender authentication (SPF, DKIM, DMARC) before mail reaches end users. Senders must maintain authentication alignment through Sophos's filters; misalignment can trigger false positives in anti-spoofing checks, particularly when the sending IP or domain is not whitelisted within the customer's Sophos configuration. Since Sophos Email is tenant-based and customer-controlled, deliverability issues can usually be resolved by working with the Sophos customer to review their inbound filtering rules and whitelist settings for your domain.
See the full Sophos Email data page (KPI cards, trend, sample domains) →
Sophos Email is used predominantly by mid-market and smaller organisations globally, making it a worthwhile testing target if your recipients include those segments, particularly across .com domains. If your audience is primarily large enterprise, Sophos may be a lower-priority testing target compared to more widely deployed ESPs.
304 domains in the Tranco top-1M use Sophos Email as their email service provider (ESP) as of July 13, 2026 (0.05% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Sophos Email accounts for 0.05% 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.
Sophos Email's largest TLD is .com (37.2% of its domains); it appears across 54 TLDs in total.