Mailbox provider · SFR Mail
How to verify a sfr.fr email address
Can you verify @sfr.fr addresses?
YesYes. @sfr.fr answers mailbox checks one address at a time.
Check one address
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The checker opens an SMTP conversation with sfr.fr's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
Mailbox existsMailbox not foundServer would not confirmSFR Mail addresses can be verified without sending an email. On 13 October 2026 the sfr.fr mail server smtp-in.sfr.fr rejected a made-up recipient at the SMTP RCPT TO step with 550 5.1.1 <…@sfr.fr>: Recipient address rejected: User unknown, so a mailbox check can tell a missing sfr.fr account from a real one.
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Live DNS snapshot: sfr.fr
Checked 6 November 2026, 08:43 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for sfr.fr goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
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smtp-in.sfr.fr
v=spf1 ip4:93.17.128.0/24 ip4:198.2.187.67 ip4:52.36.127.248 ip4:86.64.210.3 ip4:86.64.210.5 ip4:86.64.210.19 ip4:86.64.210.79 ip4:86.64.210.153 ip4:86.64.210.154 ip4:195.62.75.16/29 include:spf1.sfr.fr -allp=reject: meets the requirement and enforces it.
v=DMARC1;p=reject;rua=mailto:[email protected],mailto:[email protected];ruf=mailto:[email protected],mailto:[email protected];fo=1;adkim=s;aspf=r;sp=reject;Look up any other domain with the MX lookup or the email provider lookup.
SFR Mail at a glance
| Operated by | Société Française du Radiotéléphone - SFR, a French public limited company, Paris, FranceSource: SFR legal notice (French) |
|---|---|
| MX hosts | smtp-in.sfr.frObserved 13 October 2026 (dig MX) |
| Answer to a made-up address | 550 5.1.1 <…@sfr.fr>: Recipient address rejected: User unknown, returned at RCPT TOObserved 13 October 2026 (SMTP probe of a made-up recipient, no message sent) |
| Inactive accounts | After a SFR Box or SFR Mobile line is cancelled, 06/07 number addresses are no longer accessible; other @sfr.fr addresses stay accessible for 12 monthsSource: SFR help: access your mailbox (French) |
| Inactive accounts | SFR can block a mailbox for unusual activity, and lists not having used the address in the last 6 months as a possible reasonSource: SFR help: blocked mailbox (French) |
| Postmaster rules | SFR suspends sending from a mailbox after too many messages go to other providers in a short time; unblocking needs a chat with an adviserSource: SFR help: sending suspended (French) |
What SFR Mail's server says about a missing mailbox
The reply that matters is the one to RCPT TO, the step where the checking server names the recipient. SFR Mail answered our made-up sfr.fr address with 550 5.1.1 <…@sfr.fr>: Recipient address rejected: User unknown. A 5xx code at that step is a permanent "no such mailbox", which is the same answer a real message would get, so SimpleVerifier marks the address invalid with the reason "Mailbox not found". A 250 at the same step means the mailbox exists and comes back valid.
Before trusting a "valid", a careful verifier also offers a random address that cannot exist. SFR Mail rejected ours, so sfr.fr is not a catch-all: a 250 for your address is a real signal. Temporary 4xx replies (421, 450, 451) are about the connection, not the mailbox, and come back risky with "Server would not confirm" rather than invalid. Hard bounce vs soft bounce explains why that split matters.
@sfr.fr access ends 12 months after a line is cancelled
SFR's help page says addresses in the form [email protected] or [email protected] stop working after cancellation. Other @sfr.fr addresses stay accessible for 12 months after a SFR Box or SFR Mobile line is cancelled. Contacts who left SFR may therefore have a dead address on your list.
SFR also blocks mailboxes for unusual activity and names six months without use as one possible cause. Re-confirm old @sfr.fr contacts and remove hard bounces.
Cleaning sfr.fr addresses on a list
Because SFR Mail answers honestly, sfr.fr is one of the domains where verification removes bounces before they happen. Drop the invalid results, keep the valid ones, and re-check the risky ones later: a temporary reply on one day often turns into a clear answer the next.
A valid result only means the mailbox exists today. Addresses on an old consumer list go stale as people stop using them, so re-verify before each large send to an aged segment; how often to verify an email list gives a schedule. Upload the CSV to the verifier and download the valid, risky and invalid rows as separate files.
Common questions
- Can you verify @sfr.fr addresses?
- Yes. @sfr.fr answers mailbox checks one address at a time. The checker opens an SMTP conversation with sfr.fr's mail server, offers a random address first to rule out a catch-all, then names your address at RCPT TO and disconnects without sending. A rejection comes back invalid ("Mailbox not found") and an acceptance valid ("Mailbox exists"). Temporary replies come back risky. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
- Can I check if a sfr.fr address exists without emailing it?
- Yes. A verifier connects to SFR Mail's mail server, names the address at the RCPT TO step and disconnects before sending. On 13 October 2026 the server rejected a made-up sfr.fr address with "550 5.1.1 <…@sfr.fr>: Recipient address rejected: User unknown", so a missing mailbox shows up as invalid and the owner receives nothing.
- What mail servers does sfr.fr use?
- On 13 October 2026, sfr.fr published these MX hosts: smtp-in.sfr.fr. You can look them up yourself with the free MX lookup tool.
- Why did a sfr.fr address come back risky instead of invalid?
- Risky means the server didn't give a permanent answer during the check, usually a temporary 4xx reply or a timeout. It isn't proof the address is bad. Check it again later; SFR Mail gave a clear rejection for a missing mailbox when we tested it.
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