According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Proofpoint is the mailbox provider for 12,497 domains — 1.90% of 658,711 domains with MX records. Detection method: primary MX record (lowest preference).
Proofpoint is an email security and archival gateway operated by Proofpoint Inc., deployed by organisations to filter, scan, and log inbound and outbound email at the network perimeter.
Because Proofpoint is concentrated among mid-market and smaller organisations in the .com space, particularly those integrated with Salesforce, its presence in sender test matrices differs sharply from that of consumer ISPs or hyperscalers; senders targeting SMBs must account for its filtering rules, whilst those targeting primarily large enterprises or consumer recipients may encounter it rarely or not at all.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 73 | 0.6% |
| Top 10,000 | 407 | 3.3% |
| Top 100,000 | 2,670 | 21.4% |
| Top 1,000,000 | 8,785 | 70.3% |
| Unranked | 562 | 4.5% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 7,662 | 61.3% | |
| .org | 669 | 5.4% | |
| .com.au | 358 | 2.9% | |
| .net | 279 | 2.2% | |
| .de | 256 | 2.0% | |
| .co.uk | 246 | 2.0% | |
| .fr | 241 | 1.9% | |
| .edu | 230 | 1.8% | |
| .ca | 220 | 1.8% | |
| .gov | 166 | 1.3% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 12,497 domains.
| Type | Service | Domains | Share of Proofpoint users |
|---|---|---|---|
| ESP | Proofpoint | 4,727 | 37.8% |
| ESP | Salesforce | 1,072 | 8.6% |
| ESP | Amazon SES | 811 | 6.5% |
| ESP | Zendesk | 690 | 5.5% |
| ESP | SendGrid (Twilio) | 674 | 5.4% |
| ESP | Mandrill | 488 | 3.9% |
| ESP | HubSpot | 457 | 3.7% |
| ESP | Mailchimp | 432 | 3.5% |
| ESP | Mailgun | 324 | 2.6% |
| ESP | Marketo (Adobe) | 299 | 2.4% |
Proofpoint operates as a gateway filter rather than a mailbox provider, meaning filtering policies vary significantly between customers and are set by the deploying organisation rather than Proofpoint itself; this makes testing against a single Proofpoint instance a poor proxy for Proofpoint deployment broadly, since rejection rules, rate limits, and attachment policies differ across accounts.
See the full Proofpoint data page (KPI cards, trend, sample domains) →
Test against Proofpoint if your audience includes SMBs or mid-market organisations in English-speaking regions, especially those using Salesforce; if you primarily target large enterprises or consumer ISPs, Proofpoint is less essential to your testing matrix since it is deployed as a customer-managed gateway rather than a standardised mail service.
12,497 domains in the Tranco top-1M use Proofpoint as their mailbox provider as of July 13, 2026 (1.90% of domains with MX records), according to Live Direct Marketing's daily DNS scan.
Proofpoint accounts for 1.90% 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.
Proofpoint is declining — its share moved -0.03 pp over the last 30 days (as of July 13, 2026).
Proofpoint's largest TLD is .com (61.3% of its domains); it appears across 212 TLDs in total.