Cloudflare Email Routing email service provider (ESP)
According to Live Direct Marketing's daily Tranco top-1M scan (September 17, 2026), Cloudflare Email Routing is the email service provider (ESP) for 12,385 domains — 1.95% of 635,547 SPF-publishing domains. Detection method: include: mechanisms in the SPF record.
Key facts
- 12,385 domains in the Tranco top-1M use Cloudflare Email Routing (1.95% of SPF-publishing domains).
- Snapshot date: 2026-09-17 — recomputed every day.
- 30-day share change: +0.08 pp.
- Strongest TLD: .com (44.6% of its domains).
- Region skew: Global / US-skewed.
- Most co-used service: Cloudflare Email Routing.
- Directory category: email forwarding service.
Why Cloudflare Email Routing appears in this category
Cloudflare free email forwarding (route#.mx.cloudflare.net + spf.mx.cloudflare.net).
We classify it as a email forwarding service 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.
Cloudflare Email Routing is a free email forwarding service operated by Cloudflare, the American content-delivery and security company. It allows domain owners to set up email forwarding rules without maintaining their own mail servers, routing incoming mail to addresses of their choice via Cloudflare's infrastructure.
The service has gained adoption primarily amongst smaller websites and domain operators rather than large enterprise environments. Its adoption is globally distributed, with particular concentration in the .com namespace and across many country-code top-level domains. For email senders and recipients, this pattern means that Email Routing SPF records and forwarded mail are most commonly encountered when corresponding with smaller organisations, startups, and individual domain owners within Cloudflare's platform ecosystem.
Where Cloudflare Email Routing sits in the Tranco ranking
| Tranco rank band | Domains | Share of its base |
|---|---|---|
| Top 1,000 | 1 | 0.0% |
| Top 10,000 | 118 | 1.0% |
| Top 100,000 | 1,168 | 9.4% |
| Top 1,000,000 | 10,926 | 88.2% |
| Unranked | 172 | 1.4% |
Top-level domain split
| TLD | Domains | Share | |
|---|---|---|---|
| .com | 5,527 | 44.6% | |
| .net | 872 | 7.0% | |
| .org | 640 | 5.2% | |
| .id | 300 | 2.4% | |
| .io | 258 | 2.1% | |
| .app | 182 | 1.5% | |
| .com.br | 150 | 1.2% | |
| .co.uk | 134 | 1.1% | |
| .ai | 130 | 1.0% | |
| .ru | 130 | 1.0% |
What Cloudflare Email Routing users also use
Cross-tabulated from the same daily snapshot — the other email services seen on the same 12,385 domains.
| Type | Service | Domains | Share of Cloudflare Email Routing users |
|---|---|---|---|
| Mailbox | Cloudflare Email Routing | 11,525 | 93.1% |
| Mailbox | Google Workspace | 335 | 2.7% |
| Mailbox | Self-Hosted | 106 | 0.9% |
| Mailbox | Generic / unmatched (mail.*) | 68 | 0.5% |
| Mailbox | Zoho Mail | 47 | 0.4% |
| Mailbox | Microsoft 365 | 43 | 0.3% |
| ESP | Amazon SES | 333 | 2.7% |
| ESP | Brevo (ex-Sendinblue) | 274 | 2.2% |
| ESP | Mailgun | 148 | 1.2% |
| ESP | Mailjet (Sinch) | 126 | 1.0% |
Email authentication alignment with forwarded mail
When a domain uses Email Routing to forward incoming mail, the forwarded messages originate from Cloudflare's infrastructure rather than the original domain's mail servers. This can create DMARC alignment issues if the original domain has a strict DMARC policy, since the forwarded mail's Return-Path or From header may not align with the receiving mail server's DKIM or SPF checks. Operators and recipients should be aware that mail forwarded via Email Routing may fail DMARC validation at downstream mail servers if the original domain enforces a reject-on-fail policy.
See the full Cloudflare Email Routing data page (KPI cards, trend, sample domains) →
Run a free inbox-placement test across Gmail, Outlook, Yahoo and more — see exactly where your mail lands and why.
Frequently asked questions
Do I need to worry about Cloudflare Email Routing when sending email?
If your recipients use Cloudflare Email Routing, their mailbox provider will receive your messages after Cloudflare's forwarding layer, which can introduce DMARC or DKIM alignment issues if the original domain enforces strict authentication policies. For most senders, this is transparent, but awareness is valuable if you observe authentication failures from smaller organisations or .com domains.
How many domains use Cloudflare Email Routing?
12,385 domains in the Tranco top-1M use Cloudflare Email Routing as their email service provider (ESP) as of September 17, 2026 (1.95% of SPF-publishing domains), according to Live Direct Marketing's daily DNS scan.
Is Cloudflare Email Routing common enough to affect email deliverability testing?
Cloudflare Email Routing accounts for 1.95% 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.
Is Cloudflare Email Routing growing or declining?
Cloudflare Email Routing is growing — its share moved +0.08 pp over the last 30 days (as of September 17, 2026).
Which countries or TLDs use Cloudflare Email Routing most?
Cloudflare Email Routing's largest TLD is .com (44.6% of its domains); it appears across 393 TLDs in total.