According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), Ontraport is the email service provider (ESP) for 49 domains — 0.01% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Ontraport is a cloud-based customer relationship management and marketing automation platform that provides email delivery services to small and medium-sized businesses. The platform, operated by Ontraport Inc., integrates email campaign management, workflow automation, and customer data handling into a single interface, positioning it as a full-stack solution for businesses seeking CRM and email capabilities in one tool.
Ontraport's presence in email infrastructure appears predominantly in the long tail of the web—scattered across smaller business domains rather than concentrated among major enterprise brands—and is heavily concentrated in the .com space. It frequently appears in SPF records alongside Google Workspace, a pattern reflecting its user base of independent entrepreneurs and growing companies that combine standard email infrastructure with marketing automation. For email practitioners and deliverability engineers, this footprint means Ontraport-sourced mail originates from a dispersed, lower-traffic audience, though its authentication and reputation mechanisms still merit consideration in filtering systems and compliance workflows.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 3 | 6.1% |
| Top 1,000,000 | 43 | 87.8% |
| Unranked | 3 | 6.1% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 39 | 79.6% | |
| .org | 6 | 12.2% | |
| .co | 2 | 4.1% | |
| .com.au | 1 | 2.0% | |
| .co.uk | 1 | 2.0% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 49 domains.
| Type | Service | Domains | Share of Ontraport users |
|---|---|---|---|
| Mailbox | Google Workspace | 23 | 46.9% |
| Mailbox | Microsoft 365 | 10 | 20.4% |
| Mailbox | Self-Hosted | 8 | 16.3% |
| Mailbox | Securence (US gateway) | 1 | 2.0% |
| Mailbox | Mailgun (inbound) | 1 | 2.0% |
| Mailbox | Proofpoint Essentials | 1 | 2.0% |
| ESP | Zendesk | 7 | 14.3% |
| ESP | Amazon SES | 6 | 12.2% |
| ESP | Mailgun | 6 | 12.2% |
| ESP | Help Scout | 4 | 8.2% |
Ontraport sends email from its own infrastructure and includes SPF mechanisms in customer SPF records through dedicated include statements. When a business uses Ontraport for email campaigns, domain owners typically add an Ontraport-specific include to their SPF policy to authorise delivery from Ontraport's mail servers. This practice is standard and allows Ontraport to maintain its own sender reputation whilst allowing customers to benefit from authentication alignment. Because Ontraport users span a wide range of businesses and industries, the SPF includes associated with Ontraport appear frequently but diffusely across the web, creating a pattern of low-to-medium-volume authentication that inbox providers see regularly without it dominating any single traffic silo.
See the full Ontraport data page (KPI cards, trend, sample domains) →
Ontraport is a legitimate ESP used by smaller businesses and entrepreneurs, making it worth testing if your audience includes Ontraport users. However, since it sits in the long tail rather than among the highest-traffic providers, it is less universally critical than Gmail or Outlook.
49 domains in the Tranco top-1M use Ontraport as their email service provider (ESP) as of July 13, 2026 (0.01% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Ontraport accounts for 0.01% 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.
Ontraport's largest TLD is .com (79.6% of its domains); it appears across 5 TLDs in total.