Why did some SFR rows come back risky?

SFR answers mailbox checks, so risky usually means the check was cut short by a temporary reply, a refused connection or today's free-tool capacity. Check those rows again later before you drop them.

Is there a free bulk SFR checker?

Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks SFR's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.

Will the SFR users know I checked their address?

No. The check ends after the mail server answers about the mailbox, before any message content is sent, so nothing arrives in their inbox.

What happens to the addresses on my list that aren't SFR?

They are checked as normal addresses and marked as another provider. The live check asks about the SFR rows first.

Bulk SFR email checker: check a list of sfr.fr and neuf.fr addresses at once

In short: Checks many sfr.fr, neuf.fr and cegetel.net addresses at once: duplicates and +tag repeats flagged, and 10 mailboxes asked live at SFR's server. Limit: SFR doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.

A bulk SFR email checker tests many sfr.fr, neuf.fr and cegetel.net addresses at once. Syntax, duplicates and dead domains are flagged in your browser, then the first 10 are asked live at SFR's mail server, which rejected made-up addresses with 550 5.1.1 … User unknown on 13 October and 8 November 2026. A missing mailbox comes back invalid, a real one valid, an unclear answer risky.

More than 10 sfr.fr rows? Upload the whole list: every SFR row gets the same live mailbox check.

Check the whole list free100 free checks, no card

Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free now See pricing

SFR addresses (sfr.fr, neuf.fr, cegetel.net), one per line

Upload a CSV or TXT fileRuns in your browser. Only the domains are sent, to look up their mail servers; addresses stay on your device.

By SimpleVerifier Team · Last updated November 12, 2026

How do I check a whole list of SFR addresses?

Export the list as a CSV or copy the email column; SFR rows and every other domain can go in together.
Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.

Check which of these mailboxes really exist

How do I check if many SFR addresses exist?

Paste the addresses, one per line, or a CSV column of them. Addresses at other providers are checked as normal addresses and marked.
Press Check the SFR addresses.
Read the flagged rows: a typo domain, a duplicate, a +tag repeat of an earlier row, or a domain with no mail server.
Download the clean list. Notes stay on it; only rows that fail a check come off.
The first 10 go to SFR's mail server for a live answer. Sign in with Google to check the rest with 100 free email checks.

Example

You enter: 6 addresses: jean.dupont@sfr.fr, jean.dupont+promo@sfr.fr, Jean.Dupont@sfr.fr, a neuf.fr, a cegetel.net and a company address.
You get: Jean.Dupont@sfr.fr is marked as a duplicate of row 1 and comes off; jean.dupont+promo@sfr.fr is marked as row 1 plus a +tag and kept; the company address is marked as another provider. The live check asks SFR about the SFR rows first, and a missing mailbox comes back invalid.
Limits: The browser pass covers the first 5,000 rows; only domains leave your device. 10 live checks a day without an account, then the free checks with a Google sign-in.

Can you check if SFR addresses exist in bulk?

Yes. SFR answered made-up addresses at RCPT TO with 550 5.1.1 … User unknown on 13 October and again on 8 November 2026, so a result for an SFR row comes from SFR's own server, not a guess from the domain.

On 8 November 2026 neuf.fr and cegetel.net published the same MX host as sfr.fr, smtp-in.sfr.fr, so all three count as SFR rows here. The free page asks about 10 mailboxes live; a whole list goes through the bulk verifier, where SFR rows get the same check.

Why do old SFR addresses stop working?

SFR's help says addresses built on an 06 or 07 mobile number stop being accessible after the SFR Box or SFR Mobile line is cancelled, and other @sfr.fr addresses stay accessible for 12 months after cancellation.

So a French list collected a year or two ago can hold SFR rows that were real then and are gone now. Re-check before a campaign rather than relying on an old result.

What does the bulk SFR check do to my list?

The pass over the whole list runs in your browser: syntax, duplicates, typo domains and role addresses. Only the unique domains are sent out, to look up mail servers and the disposable list. Rows at sfr.fr, neuf.fr and cegetel.net are matched by the part after the @, so an address at any other domain is checked as a normal address and marked as another provider.

Then the first 10 addresses, SFR rows first, are asked live at the mail server without sending anything. Sign in with Google to check the rest with 100 free email checks. For one address with full notes, use the SFR checker.

What does each check catch on a SFR list?

Check	Can we confirm it?	Result when it fails
Syntax and duplicates	Yes, in your browser	Bad syntax comes off; a duplicate is marked
Domain and mail server (MX)	Yes, from DNS	No mail server comes off
Disposable or role address	Yes	Disposable comes off; a role address is marked
The mailbox exists	Yes: SFR answers at RCPT TO (550 5.1.1 User unknown)	Invalid, "Mailbox not found"; an unclear reply is risky
Someone reads the inbox	No checker can	Use opens, replies or a small first send

Mailbox behaviour as measured on sfr.fr on 13 October and 8 November 2026.

Who uses this tool, and for what?

French shops and newsletters: Drop sfr.fr and neuf.fr rows whose line was cancelled before the next campaign.
Lead buyers: Check the French ISP webmail rows of a bought list before importing it.
List owners: Find repeated rows and +tag copies before counting your audience.

What can’t this tool tell you?

SFR doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
Typo-domain detection covers the big webmail domains and slips like .con, not French domain misspellings.
A +tag repeat is marked as possibly the same inbox, not merged, because this page doesn't verify how SFR treats tags.
The live check covers 10 addresses without an account; risky results there can mean the check was cut short, so try again later.
Valid means the mailbox exists today, not that anyone reads it.

Common questions

Are neuf.fr and cegetel.net SFR addresses?: They use SFR's mail server: on 8 November 2026 neuf.fr and cegetel.net published the same MX host as sfr.fr, smtp-in.sfr.fr, so this page counts all three as SFR rows.
Why did some SFR rows come back risky?: SFR answers mailbox checks, so risky usually means the check was cut short by a temporary reply, a refused connection or today's free-tool capacity. Check those rows again later before you drop them.
Is there a free bulk SFR checker?: Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks SFR's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.
Will the SFR users know I checked their address?: No. The check ends after the mail server answers about the mailbox, before any message content is sent, so nothing arrives in their inbox.
What happens to the addresses on my list that aren't SFR?: They are checked as normal addresses and marked as another provider. The live check asks about the SFR rows first.

Sources

A tidy list can still be full of dead addresses.

Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.

Upload the cleaned file as it is: CSVs up to 100,000 rows
A real SMTP mailbox check on every row, with catch-all detection
Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime

Get started — $39/mo See the published limits first

Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.