Bulk La Poste email checker: check a list of laposte.net addresses at once
In short: Checks many laposte.net addresses at once: duplicates and +tag repeats flagged, and 10 mailboxes asked live at La Poste's server. Limit: La Poste doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
A bulk La Poste email checker tests many laposte.net addresses at once. Syntax, duplicates and dead domains are flagged in your browser, then the first 10 are asked live at La Poste's mail server, which rejected made-up addresses with 550 5.1.1 … User unknown on 12 October and 8 November 2026. A missing mailbox comes back invalid, a real one valid, an unclear answer risky.
More than 10 laposte.net rows? Upload the whole list: every La Poste row gets the same live mailbox check.
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 nowSee pricing
By SimpleVerifier Team · Last updated
How do I check a whole list of La Poste addresses?
- Export the list as a CSV or copy the email column; La Poste 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.
How do I check if many laposte.net 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 La Poste 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 La Poste'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@laposte.net,jean.dupont+promo@laposte.net,Jean.Dupont@laposte.net, two more laposte.net and a company address. - You get
Jean.Dupont@laposte.netis marked as a duplicate of row 1 and comes off;jean.dupont+promo@laposte.netis marked as row 1 plus a +tag and kept. The live check asks La Poste about the laposte.net 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 laposte.net addresses exist in bulk?
Yes. La Poste answered made-up addresses at RCPT TO with 550 5.1.1 … User unknown (reference LPN007_416) on 12 October and again on 8 November 2026, so a result for a laposte.net row comes from La Poste's own server.
The free page asks about 10 mailboxes live. A whole list goes through the bulk verifier, where laposte.net rows get the same check.
Why do laposte.net addresses go dead?
The laposte.net terms treat a mailbox with no login for four consecutive months as frozen and allow permanent deletion after 28 months with no activity. A new mailbox never opened in its first 72 hours is deleted.
A deleted address can't be created again for 30 years, so a dead laposte.net row will not come back to life: remove it.
What does the bulk La Poste 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 laposte.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, La Poste 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 La Poste checker.
What does each check catch on a La Poste 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: La Poste 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 laposte.net on 12 October and 8 November 2026.
Who uses this tool, and for what?
- French associations and newsletters
- Drop frozen or deleted laposte.net rows before a mailing.
- Lead buyers
- Check the laposte.net rows of a French list before importing it.
- List owners
- Find repeated rows and +tag copies before counting your audience.
What can’t this tool tell you?
- La Poste doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
- A frozen mailbox can still exist; the check reports what the server answers today.
- A +tag repeat is marked as possibly the same inbox, not merged, because this page doesn't verify how La Poste 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
- What does LPN007_416 mean in a La Poste bounce?
- It is La Poste's own reference on the 550 5.1.1 User unknown rejection we got for a made-up address. Treat it as a hard bounce and remove the address.
- Does laposte.net delete inactive mailboxes?
- Its terms treat a mailbox with no login for four consecutive months as frozen and allow permanent deletion after 28 months with no activity.
- Is there a free bulk La Poste checker?
- Yes. This page checks a whole list for syntax, duplicates, typo domains and dead domains for free, asks La Poste's server about 10 mailboxes live, and gives 100 free email checks with a Google sign-in. No card.
- Will the La Poste 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 La Poste?
- They are checked as normal addresses and marked as another provider. The live check asks about the La Poste 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
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.