Proofpoint email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 24, 2026), Proofpoint is the email service provider (ESP) for 5,747 domains — 0.90% of 637,420 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 5,747 domains in the Tranco top-1M use Proofpoint (0.90% of SPF-publishing domains).
- Snapshot date: 2026-09-24 — recomputed every day.
- 30-day share change: -0.03 pp.
- Strongest TLD: .com (56.6% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Proofpoint.
- Directory category: email security gateway.
Why Proofpoint appears in this category
Proofpoint — leading enterprise email security gateway providing inbound filtering and outbound DLP.
We classify it as a email security gateway from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
What the data shows
79.3% of its domains sit outside the top 100,000 — a long-tail footprint spread across smaller sites. Its single largest TLD is .com at 56.6% of its domains — a strong concentration across 179 TLDs overall. Over the last 30 days it lost 0.03 pp of share. The service most often seen alongside it is Proofpoint (mailbox provider), on 82.8% of its domains.
Where Proofpoint sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 14 | 0.2% |
| Top 10,000 | 146 | 2.5% |
| Top 100,000 | 994 | 17.3% |
| Top 1,000,000 | 4,557 | 79.3% |
| Unranked | 36 | 0.6% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 3,251 | 56.6% | |
| .org | 304 | 5.3% | |
| .com.au | 182 | 3.2% | |
| .fr | 136 | 2.4% | |
| .de | 130 | 2.3% | |
| .net | 122 | 2.1% | |
| .ca | 115 | 2.0% | |
| .com.br | 111 | 1.9% | |
| .gov | 110 | 1.9% | |
| .co.uk | 104 | 1.8% |
What Proofpoint users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 5,747 domains.
| Type | Service | Domains | Share of Proofpoint users |
|---|---|---|---|
| Mailbox | Proofpoint | 4,760 | 82.8% |
| Mailbox | Microsoft 365 | 414 | 7.2% |
| Mailbox | Google Workspace | 100 | 1.7% |
| Mailbox | Unknown / Other | 90 | 1.6% |
| Mailbox | Self-Hosted | 69 | 1.2% |
| Mailbox | Mimecast | 44 | 0.8% |
| ESP | Salesforce | 812 | 14.1% |
| ESP | Amazon SES | 582 | 10.1% |
| ESP | Zendesk | 541 | 9.4% |
| ESP | SendGrid (Twilio) | 512 | 8.9% |
See the full Proofpoint data page (KPI cards, trend, sample domains) →
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Frequently asked questions
How many domains use Proofpoint?
5,747 domains in the Tranco top-1M use Proofpoint as their email service provider (ESP) as of September 24, 2026 (0.90% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Proofpoint common enough to affect email deliverability testing?
Proofpoint accounts for 0.90% 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.
Is Proofpoint growing or declining?
Proofpoint is declining — its share moved -0.03 pp over the last 30 days (as of September 24, 2026).
Which countries or TLDs use Proofpoint most?
Proofpoint's largest TLD is .com (56.6% of its domains); it appears across 179 TLDs in total.