According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Proofpoint is the email service provider (ESP) for 5,769 domains — 0.93% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
73.8% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .com at 56.2% of its domains — a strong concentration across 179 TLDs overall. The service most often seen alongside it is Proofpoint (mailbox provider), on 81.9% of its domains.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 17 | 0.3% |
| Top 10,000 | 160 | 2.8% |
| Top 100,000 | 1,033 | 17.9% |
| Top 1,000,000 | 4,255 | 73.8% |
| Unranked | 304 | 5.3% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 3,242 | 56.2% | |
| .org | 306 | 5.3% | |
| .com.au | 187 | 3.2% | |
| .fr | 145 | 2.5% | |
| .de | 141 | 2.4% | |
| .ca | 118 | 2.0% | |
| .net | 116 | 2.0% | |
| .gov | 111 | 1.9% | |
| .com.br | 109 | 1.9% | |
| .co.uk | 100 | 1.7% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 5,769 domains.
| Type | Service | Domains | Share of Proofpoint users |
|---|---|---|---|
| Mailbox | Proofpoint | 4,727 | 81.9% |
| Mailbox | Microsoft 365 | 396 | 6.9% |
| Mailbox | Unknown / Other | 121 | 2.1% |
| Mailbox | Google Workspace | 111 | 1.9% |
| Mailbox | Self-Hosted | 76 | 1.3% |
| Mailbox | Mimecast | 41 | 0.7% |
| ESP | Salesforce | 784 | 13.6% |
| ESP | Amazon SES | 554 | 9.6% |
| ESP | Zendesk | 515 | 8.9% |
| ESP | SendGrid (Twilio) | 497 | 8.6% |
See the full Proofpoint data page (KPI cards, trend, sample domains) →
5,769 domains in the Tranco top-1M use Proofpoint as their email service provider (ESP) as of July 13, 2026 (0.93% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Proofpoint accounts for 0.93% 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.
Proofpoint's largest TLD is .com (56.2% of its domains); it appears across 179 TLDs in total.