According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), User.com is the SaaS sender for 189 domains — 0.03% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
User.com is a software-as-a-service platform that sends email on behalf of customer domains. It operates as an outbound email delivery agent, typically configured via SPF include mechanisms in customer DNS records.
User.com's footprint concentrates in the midmarket segment, particularly within Polish domains, and frequently appears alongside Google Workspace. This pattern reflects its adoption among organisations with hybrid email infrastructure. For anyone involved in email deliverability—whether sending through User.com, receiving its traffic, or auditing sender configurations—User.com is most commonly encountered in medium-sized domain profiles with Central European presence rather than the largest global properties.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 24 | 12.7% |
| Top 1,000,000 | 159 | 84.1% |
| Unranked | 6 | 3.2% |
| TLD | Domains | Share | |
|---|---|---|---|
| .pl | 91 | 48.1% | |
| .com | 36 | 19.0% | |
| .se | 7 | 3.7% | |
| .cz | 6 | 3.2% | |
| .com.pl | 6 | 3.2% | |
| .io | 5 | 2.6% | |
| .de | 5 | 2.6% | |
| .fr | 4 | 2.1% | |
| .ro | 4 | 2.1% | |
| .eu | 3 | 1.6% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 189 domains.
| Type | Service | Domains | Share of User.com users |
|---|---|---|---|
| Mailbox | Google Workspace | 68 | 36.0% |
| Mailbox | Microsoft 365 | 55 | 29.1% |
| Mailbox | Unknown / Other | 20 | 10.6% |
| Mailbox | Self-Hosted | 17 | 9.0% |
| Mailbox | Generic / unmatched (mail.*) | 8 | 4.2% |
| Mailbox | Proofpoint Essentials | 3 | 1.6% |
User.com operates as a delegated email agent, meaning organisations authorise it to send email from their domains via SPF include mechanisms. This delegation model is standard for SaaS platforms, but when User.com is deployed alongside other outbound channels—such as Google Workspace—SPF records become more complex. Organisations should monitor their SPF configuration to avoid DNS lookup limit issues, which can degrade authentication validation. Proper SPF configuration is essential to maintain authentication integrity across hybrid email infrastructure.
See the full User.com data page (KPI cards, trend, sample domains) →
User.com appears in your SPF records if your organisation uses it for outbound email delivery. The SPF include delegates mail authentication to User.com's sending infrastructure, a standard practice for SaaS email platforms.
189 domains in the Tranco top-1M use User.com as their SaaS sender as of July 13, 2026 (0.03% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
User.com 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.
User.com's largest TLD is .pl (48.1% of its domains); it appears across 29 TLDs in total.