Mailbox provider · La Poste
How to verify a laposte.net email address
Can you verify @laposte.net addresses?
YesYes. @laposte.net answers mailbox checks one address at a time.
Check one address
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
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The checker opens an SMTP conversation with laposte.net'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 confirmLa Poste addresses can be verified without sending an email. On 12 October 2026 the laposte.net mail server smtpz4.laposte.net rejected a made-up recipient at the SMTP RCPT TO step with 550 5.1.1 Recipient address rejected: User unknown. Adresse destinataire invalide. Invalid recipient. LPN007_416, so a mailbox check can tell a missing laposte.net account from a real one.
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Live DNS snapshot: laposte.net
Checked 6 November 2026, 11:12 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for laposte.net goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
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smtpz4.laposte.net
v=spf1 include:_spfbloc2.laposte.net include:_spf.lpn.as8677.net -allp=reject: meets the requirement and enforces it.
v=DMARC1;p=reject;sp=reject;rua=mailto:[email protected],mailto:[email protected];ruf=mailto:[email protected],mailto:[email protected];rf=afrf;Look up any other domain with the MX lookup or the email provider lookup.
La Poste at a glance
| Operated by | La Poste, a French public limited company (société anonyme), Paris, FranceSource: laposte.net legal notice (French) |
|---|---|
| MX hosts | smtpz4.laposte.netObserved 12 October 2026 (dig MX) |
| Answer to a made-up address | 550 5.1.1 Recipient address rejected: User unknown. Adresse destinataire invalide. Invalid recipient. LPN007_416, returned at RCPT TOObserved 12 October 2026 (SMTP probe of a made-up recipient, no message sent) |
| Address rule | A deleted address and its aliases cannot be created again for 30 years after deletionSource: laposte.net terms of use (French) |
| Inactive accounts | A mailbox with no login for four consecutive months is treated as frozen and its contents can be purged; an account with no activity for 28 consecutive months is deleted permanentlySource: laposte.net terms of use (French) |
| Inactive accounts | A new mailbox with no login in its first 72 hours is deleted automatically, even if it is not emptySource: laposte.net help: when does an address become inactive (French) |
| Postmaster rules | Mail sent to laposte.net without a valid DKIM signature is refusedSource: laposte.net postmaster help: DKIM rejections (French) |
What La Poste'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. La Poste answered our made-up laposte.net address with 550 5.1.1 Recipient address rejected: User unknown. Adresse destinataire invalide. Invalid recipient. LPN007_416. 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. La Poste rejected ours, so laposte.net 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.
laposte.net freezes mailboxes after four months
The laposte.net terms treat a mailbox with no login for four consecutive months as frozen, with its contents open to purging. They also allow permanent deletion after 28 months with no activity. A help page adds that a new mailbox never opened in its first 72 hours is deleted. Old @laposte.net addresses on a list may therefore point at empty or removed mailboxes.
Deleted addresses are not handed to someone else for 30 years, so a dead address stays dead rather than being recycled. If you send from your own domain, note that laposte.net refuses mail without a valid DKIM signature. Remove contacts that bounce and re-confirm older ones.
Cleaning laposte.net addresses on a list
Because La Poste answers honestly, laposte.net 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 @laposte.net addresses?
- Yes. @laposte.net answers mailbox checks one address at a time. The checker opens an SMTP conversation with laposte.net'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 laposte.net address exists without emailing it?
- Yes. A verifier connects to La Poste's mail server, names the address at the RCPT TO step and disconnects before sending. On 12 October 2026 the server rejected a made-up laposte.net address with "550 5.1.1 Recipient address rejected: User unknown. Adresse destinataire invalide. Invalid recipient. LPN007_416", so a missing mailbox shows up as invalid and the owner receives nothing.
- What mail servers does laposte.net use?
- On 12 October 2026, laposte.net published these MX hosts: smtpz4.laposte.net. You can look them up yourself with the free MX lookup tool.
- Why did a laposte.net 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; La Poste gave a clear rejection for a missing mailbox when we tested it.
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