Klaviyo email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 13, 2026), Klaviyo is the email service provider (ESP) for 587 domains — 0.09% of 628,913 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 587 domains in the Tranco top-1M use Klaviyo (0.09% of SPF-publishing domains).
- Snapshot date: 2026-09-13 — recomputed every day.
- Strongest TLD: .com (68.1% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why Klaviyo appears in this category
E-commerce-focused marketing automation, dominant on Shopify.
We classify it as a email service provider from include: mechanisms in the SPF record matching a maintained provider rule. This is infrastructure attribution from public DNS, not evidence of a direct contract or exclusive use.
Klaviyo is a commercial email service provider and marketing automation platform operated as a shared sending infrastructure serving thousands of organisations worldwide.
Across the global DNS landscape, Klaviyo appears predominantly as an SPF include on smaller and mid-market websites, concentrated in the .com space and frequently deployed alongside Google Workspace. This pattern reflects its role serving a long tail of organisations rather than the world's largest brands, a fact that shapes how its infrastructure relates to filtering and reputation systems.
Where Klaviyo sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 1 | 0.2% |
| Top 100,000 | 22 | 3.7% |
| Top 1,000,000 | 561 | 95.6% |
| Unranked | 3 | 0.5% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 400 | 68.1% | |
| .co.uk | 22 | 3.7% | |
| .com.au | 20 | 3.4% | |
| .de | 19 | 3.2% | |
| .nl | 12 | 2.0% | |
| .ca | 11 | 1.9% | |
| .co | 9 | 1.5% | |
| .fr | 8 | 1.4% | |
| .se | 6 | 1.0% | |
| .es | 6 | 1.0% |
What Klaviyo users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 587 domains.
| Type | Service | Domains | Share of Klaviyo users |
|---|---|---|---|
| Mailbox | Google Workspace | 320 | 54.5% |
| Mailbox | Microsoft 365 | 150 | 25.6% |
| Mailbox | Self-Hosted | 15 | 2.6% |
| Mailbox | Unknown / Other | 11 | 1.9% |
| Mailbox | Mimecast | 9 | 1.5% |
| Mailbox | Zoho Mail | 8 | 1.4% |
| ESP | Zendesk | 109 | 18.6% |
| ESP | SendGrid (Twilio) | 90 | 15.3% |
| ESP | Mailgun | 87 | 14.8% |
| ESP | Amazon SES | 48 | 8.2% |
Shared sending infrastructure and reputation dynamics
Because Klaviyo serves a broad base of smaller to mid-market organisations, its sending IP ranges carry reputation shaped by the aggregate behaviour of that customer base rather than a single brand. Organisations filtering inbound mail see Klaviyo's infrastructure as a shared channel, which means compromised accounts or poorly-managed lists on one customer can affect the reputation of all others sending through the same IPs. The concentration in the .com space and common pairing with Google Workspace deployments means Klaviyo traffic often originates from organisations using complementary, lower-complexity email stacks.
See the full Klaviyo data page (KPI cards, trend, sample domains) →
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Frequently asked questions
What is Klaviyo and where does it fit in the email ecosystem?
Klaviyo is a commercial email service provider and marketing automation platform serving smaller to mid-market organisations, concentrated in the .com space and often deployed alongside Google Workspace. Its shared sending infrastructure means reputation and filtering practices within Klaviyo's IP ranges are shaped by the aggregate behaviour of its entire customer base.
How many domains use Klaviyo?
587 domains in the Tranco top-1M use Klaviyo as their email service provider (ESP) as of September 13, 2026 (0.09% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Klaviyo common enough to affect email deliverability testing?
Klaviyo accounts for 0.09% 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.
Which countries or TLDs use Klaviyo most?
Klaviyo's largest TLD is .com (68.1% of its domains); it appears across 48 TLDs in total.