numericable.fr email servers, SPF and DMARC

numericable.fr publishes a single MX host, smtp-in.sfr.fr. With no backup host, a sender that can't reach it queues the message and retries until the server answers or the queue gives up.

1 other domain we checked on the same day also route mail to hosts under sfr.fr, with different records from numericable.fr: neuf.fr.

The record on 5 November 2026 was v=spf1 ip4:93.17.128.0/24 -all.

In plain terms, lists 1 IP range directly. The top level uses 0 DNS-querying terms; SPF allows 10 in total including nested includes (RFC 7208 §4.6.4).

It ends in a hard fail (-all): receivers may reject mail from any server the record does not list.

The record is v=DMARC1; p=quarantine; sp=reject; adkim=s; aspf=s; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected]; fo=1.

p=quarantine asks receivers to send failing mail to spam. Subdomains get sp=reject.

Aggregate reports go to sfr.fr and rua.netcraft.com, so the domain's owner sees who sends mail as @numericable.fr.

What that means for you: if a contact gives an @numericable.fr address and you send to them, nothing changes. But never put an @numericable.fr address in the From line of mail sent through your own tool or ESP. It can't pass DMARC for numericable.fr, and this policy tells receivers to junk it.

4 other domains published exactly the same MX hosts and SPF record as numericable.fr on 5 November 2026: 9online.fr, cegetel.net, club-internet.fr and noos.fr. Mail to any of them lands on the same servers.

numericable.fr shares smtp-in.sfr.fr with sfr.fr. When we tested those servers for sfr.fr on 13 October 2026, the result was: Verifiable. The server rejects unknown recipients during the SMTP conversation.

Our checker treats @numericable.fr like any domain: syntax, MX, disposable and role checks first, then a made-up address to rule out a catch-all, then your address at RCPT TO, disconnecting without sending. We have not tested @numericable.fr itself, but its mail goes to the same servers as sfr.fr, so expect @numericable.fr results to follow the pattern described there. Each result carries its own reason.

DNS tells you where mail goes, not whether one person's mailbox still exists. For a list, run the whole file through a verifier before you send: invalid rows come out, risky rows (catch-all, unknown, refused) go in their own segment, and valid rows are safe to mail.