ConvertKit email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 14, 2026), ConvertKit is the email service provider (ESP) for 36 domains — 0.01% of 637,677 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 36 domains in the Tranco top-1M use ConvertKit (0.01% of SPF-publishing domains).
- Snapshot date: 2026-09-14 — recomputed every day.
- Strongest TLD: .com (80.6% of its domains).
- Most co-used service: Google Workspace.
- Directory category: email service provider.
Why ConvertKit appears in this category
Creator-focused newsletter platform (rebranded to Kit).
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.
ConvertKit is an email service provider that powers campaigns for creators, online coaches, and independent business owners. In practice, it sits behind the infrastructure of smaller and mid-market digital-first sites, concentrated in the .com domain space rather than among the largest global brands.
For email teams and senders, ConvertKit's presence in the infrastructure layer means understanding its SPF practices is most relevant when your audience includes creators and independent professionals—a segment that does not define global email traffic but is disproportionately important for certain sender demographics. Knowing where ConvertKit sits in the email ecosystem helps both senders and mail administrators gauge deliverability context appropriately.
Where ConvertKit sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 0 | 0.0% |
| Top 10,000 | 0 | 0.0% |
| Top 100,000 | 3 | 8.3% |
| Top 1,000,000 | 33 | 91.7% |
| Unranked | 0 | 0.0% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 29 | 80.6% | |
| .org | 3 | 8.3% | |
| .io | 1 | 2.8% | |
| .co | 1 | 2.8% | |
| .de | 1 | 2.8% | |
| .co.uk | 1 | 2.8% |
What ConvertKit users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 36 domains.
| Type | Service | Domains | Share of ConvertKit users |
|---|---|---|---|
| Mailbox | Google Workspace | 24 | 66.7% |
| Mailbox | Self-Hosted | 6 | 16.7% |
| Mailbox | Namecheap PrivateEmail | 1 | 2.8% |
| Mailbox | Cloudflare Email Routing | 1 | 2.8% |
| Mailbox | Unknown / Other | 1 | 2.8% |
| Mailbox | ProtonMail | 1 | 2.8% |
| ESP | Amazon SES | 7 | 19.4% |
| ESP | Postmark | 4 | 11.1% |
| ESP | Mailgun | 4 | 11.1% |
| ESP | SendGrid (Twilio) | 4 | 11.1% |
SPF mechanisms and smaller sender networks
ConvertKit appears in SPF records across smaller sites in the .com space, where it serves as an authentication vector for creators and independent professionals sending mail. Understanding ConvertKit's SPF footprint is relevant not because it represents a majority of global email, but because correctly interpreting those records matters when evaluating authentication chains and sender reputation in contexts where your audience or policy scope includes smaller digital-first businesses.
See the full ConvertKit data page (KPI cards, trend, sample domains) →
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Frequently asked questions
Should I test my email deliverability against ConvertKit?
Test against ConvertKit if your audience includes creators and independent professionals, though it is less critical than testing against major consumer platforms. For mail administrators, understanding its SPF practices is relevant when validating sender authentication chains in creator-focused contexts.
How many domains use ConvertKit?
36 domains in the Tranco top-1M use ConvertKit as their email service provider (ESP) as of September 14, 2026 (0.01% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is ConvertKit common enough to affect email deliverability testing?
ConvertKit 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.
Which countries or TLDs use ConvertKit most?
ConvertKit's largest TLD is .com (80.6% of its domains); it appears across 6 TLDs in total.