According to Live Direct Marketing's daily Tranco top-1M scan (July 13, 2026), SparkPost is the email service provider (ESP) for 2,626 domains — 0.43% of 617,702 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
SparkPost is a commercial email service provider that manages message transmission infrastructure for websites and applications. It is detected across the web primarily through its presence in DNS SPF records, where it appears as a delegated outbound mail handler for organisations that use its platform.
Analysis of DNS records across the Tranco top-1 million list reveals that SparkPost's footprint concentrates in smaller and mid-sized websites rather than the largest global brands, predominantly in the .com space. This distribution, combined with frequent use alongside Google Workspace, indicates that SparkPost's infrastructure is largely shaped by the sending patterns of small-to-medium businesses rather than enterprise senders.
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 7 | 0.3% |
| Top 10,000 | 34 | 1.3% |
| Top 100,000 | 383 | 14.6% |
| Top 1,000,000 | 1,975 | 75.2% |
| Unranked | 227 | 8.6% |
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 1,230 | 46.8% | |
| .cz | 237 | 9.0% | |
| .org | 182 | 6.9% | |
| .net | 71 | 2.7% | |
| .co.uk | 65 | 2.5% | |
| .nl | 58 | 2.2% | |
| .sk | 56 | 2.1% | |
| .ro | 49 | 1.9% | |
| .de | 41 | 1.6% | |
| .io | 36 | 1.4% |
Cross-tabulated from the same daily snapshot — the other email services seen on the same 2,626 domains.
| Type | Service | Domains | Share of SparkPost users |
|---|---|---|---|
| Mailbox | Google Workspace | 1,084 | 41.3% |
| Mailbox | Microsoft 365 | 597 | 22.7% |
| Mailbox | Self-Hosted | 246 | 9.4% |
| Mailbox | Unknown / Other | 139 | 5.3% |
| Mailbox | Mimecast | 62 | 2.4% |
| Mailbox | Generic / unmatched (mx*.*) | 46 | 1.8% |
| ESP | Mandrill | 378 | 14.4% |
| ESP | Amazon SES | 371 | 14.1% |
| ESP | Zendesk | 289 | 11.0% |
| ESP | Mailchimp | 280 | 10.7% |
When a site delegates email sending to SparkPost, its SPF records reflect this by including SparkPost's authorised transmission infrastructure. This arrangement means that a sender's reputation is partly shared across all SparkPost customers—poor sending practices or abuse by any one customer can degrade deliverability for others, whilst positive sender behaviour benefits the entire shared IP reputation pool.
See the full SparkPost data page (KPI cards, trend, sample domains) →
SparkPost is a third-party email service provider that handles transmission infrastructure for organisations; it appears in DNS SPF records when a site uses it to send email. It is widely used by smaller and mid-market businesses, often in conjunction with Google Workspace.
2,626 domains in the Tranco top-1M use SparkPost as their email service provider (ESP) as of July 13, 2026 (0.43% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
SparkPost accounts for 0.43% 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.
SparkPost has been stable — its share moved +0.01 pp over the last 30 days (as of July 13, 2026).
SparkPost's largest TLD is .com (46.8% of its domains); it appears across 136 TLDs in total.