esp
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. Its strongest TLD is .com (79.6% of its domains). Detection: include: mechanisms in the SPF record.
What else the same 49 domains use — cross-tabulated from the same daily snapshot (2026-07-13).
| 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 | Proofpoint Essentials | 1 | 2.0% |
| Mailbox | Cloudflare Email Routing | 1 | 2.0% |
| Mailbox | Cisco IronPort | 1 | 2.0% |
| ESP | Zendesk | 7 | 14.3% |
| ESP | Mailgun | 6 | 12.2% |
| ESP | Amazon SES | 6 | 12.2% |
| ESP | Help Scout | 4 | 8.2% |
49 domains in the Tranco top-1M use Ontraport as their email service provider (ESP) as of July 13, 2026, according to Live Direct Marketing's daily DNS scan.
Ontraport holds 0.01% of SPF-publishing domains in the Tranco top-1M (snapshot of 2026-07-13). The number is recomputed every day.
The largest email service provider (ESP)s in the same category by Tranco top-1M share are: Amazon SES, SendGrid (Twilio), Mailgun, Zendesk, Mailchimp (as of 2026-07-13).
Amazon SES (6.21%) · SendGrid (Twilio) (4.76%) · Mailgun (4.11%) · Zendesk (3.86%) · Mailchimp (3.69%) · Mandrill (3.36%) · HubSpot (3.18%) · Salesforce (2.62%) · Mailjet (Sinch) (2.13%) · Cloudflare Email Routing (1.80%)
Showing 49 of 49 domains.