Is cool.fr.nf a disposable email provider?
Yes. cool.fr.nf is a known throwaway provider, and right now it accepts mail via an implicit MX.
What cool.fr.nf actually does right now
Checked against live DNS when this page was last built. Most pages answering this question quote a list; this one quotes the domain.
| Mail routing | accepts mail via an implicit MX |
| MX hosts | cool.fr.nf |
| SPF published | no |
| DMARC published | no |
| Related domains on our list | 5 |
No MX record, but the domain resolves, so RFC 5321 says mail goes to the A record. It still accepts, it just does not advertise.
Blocking it
GET /v1/email/verify?email=someone@cool.fr.nf
→ "sub_status": "disposable", "score": 5Sub-domains match the same rule, so anything.cool.fr.nf is caught too.
Classification is a set lookup, so it costs no latency; the DNS evidence above
is what the deep flag adds.
Why throwaway signups cost money, and the full provider list with live status →
Verify at scale, not one at a time
The same checks over a REST API: 250 calls per period free, no credit card, no sales call.