According to Live Direct Marketing's daily Tranco top-1M scan (July 12, 2026), HubSpot is the email service provider (ESP) for 19,621 domains — 3.18% of 617,244 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
HubSpot is a marketing automation and CRM platform operated by HubSpot Inc., widely used to send email campaigns and transactional messages via its cloud infrastructure. Email sent through HubSpot is authenticated using SPF includes that delegate sending authority to HubSpot's mail servers.
HubSpot's footprint in the web's top-1M domains skews towards smaller and mid-market organisations rather than the largest enterprises, concentrated in the .com domain space, and often paired with Google Workspace adoption. For anyone operating mail systems, HubSpot in a sender's SPF record signals legitimate infrastructure delegation. Proper SPF configuration is critical; misconfiguration can break email authentication and reduce deliverability, whilst receivers should treat HubSpot as a standard provider rather than an indicator of suspicious sending practices.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 40 | 0.2% |
| Top 10,000 | 279 | 1.4% |
| Top 100,000 | 2,859 | 14.6% |
| Top 1,000,000 | 15,009 | 76.5% |
| Unranked | 1,434 | 7.3% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 12,792 | 65.2% | |
| .org | 921 | 4.7% | |
| .io | 779 | 4.0% | |
| .de | 445 | 2.3% | |
| .ai | 424 | 2.2% | |
| .co.uk | 314 | 1.6% | |
| .net | 313 | 1.6% | |
| .co | 296 | 1.5% | |
| .com.br | 244 | 1.2% | |
| .com.au | 222 | 1.1% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 19,621 domains.
| Type | Service | Domains | Share of HubSpot users |
|---|---|---|---|
| Mailbox | Google Workspace | 9,575 | 48.8% |
| Mailbox | Microsoft 365 | 6,384 | 32.5% |
| Mailbox | Mimecast | 818 | 4.2% |
| Mailbox | Proofpoint | 460 | 2.3% |
| Mailbox | Unknown / Other | 436 | 2.2% |
| Mailbox | Self-Hosted | 391 | 2.0% |
| ESP | Amazon SES | 3,513 | 17.9% |
| ESP | Zendesk | 3,244 | 16.5% |
| ESP | SendGrid (Twilio) | 3,243 | 16.5% |
| ESP | Salesforce | 2,541 | 13.0% |
A common pattern amongst HubSpot users is deployment alongside Google Workspace, creating an SPF record that authorises both Google's and HubSpot's mail servers. Both providers require SPF includes in the domain's record, and organisations must ensure both are present and correctly configured. Misconfiguration — omitting HubSpot's include, placing it in the wrong subdomain, or causing SPF lookup exhaustion — breaks authentication for HubSpot-sent mail. Receivers should not penalise the mere presence of multiple providers in an SPF record; instead, they should evaluate the authentication result itself and flag only where the include is malformed or absent.
See the full HubSpot data page (KPI cards, trend, sample domains) →
It means the sender has delegated email sending to HubSpot's infrastructure. Provided the SPF include is configured correctly, this is a standard part of multi-provider email stacks and should not negatively affect delivery; however, misconfigured or missing includes will cause SPF failure and reduced deliverability.
19,621 domains in the Tranco top-1M use HubSpot as their email service provider (ESP) as of July 12, 2026 (3.18% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
HubSpot accounts for 3.18% 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.
HubSpot has been stable — its share moved +0.01 pp over the last 30 days (as of July 12, 2026).
HubSpot's largest TLD is .com (65.2% of its domains); it appears across 285 TLDs in total.