Mailbox provider · Xtra Mail
How to verify a xtra.co.nz email address
Can you verify @xtra.co.nz addresses?
YesYes. @xtra.co.nz answers mailbox checks one address at a time.
Check one address
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The checker opens an SMTP conversation with xtra.co.nz'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 confirmXtra Mail addresses can be verified without sending an email. On 23 October 2026 the xtra.co.nz mail server mx.xtra.co.nz rejected a made-up recipient at the SMTP RCPT TO step with 550 5.1.1 User unknown, so a mailbox check can tell a missing xtra.co.nz account from a real one.
Live DNS snapshot: xtra.co.nz
Checked 26 October 2026, 06:04 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for xtra.co.nz goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
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mx.xtra.co.nz
v=spf1 ip4:210.55.143.48/29 include:spf.nzn.prd.xm.smxcloud.com ~allp=none: meets the requirement, but blocks nothing.
v=DMARC1; p=none; sp=reject; rua=mailto:rua@dmarc.xtra.co.nzLook up any other domain with the MX lookup or the email provider lookup.
Xtra Mail at a glance
| Operated by | Spark New Zealand Trading Limited, New Zealand (Xtra Mail is provided by Spark)Source: Spark privacy policy (PDF) |
|---|---|
| MX hosts | mx.xtra.co.nzObserved 23 October 2026 (dig MX) |
| Answer to a made-up address | 550 5.1.1 User unknown, returned at RCPT TOObserved 23 October 2026 (SMTP probe of a made-up recipient, no message sent) |
| Address rule | Xtra Mail is a paid Spark subscription; cancelling it ends every Xtra Mail address on the account at the next billing date, and restoring a deleted address means contacting SparkSource: Spark help: manage your Xtra Mail account |
| Inactive accounts | Deleting an Xtra Mail account can be undone within 90 days, but Xtra Mail subscription fees apply on recoverySource: Spark: Xtra Mail closing checklist (PDF) |
What Xtra 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. Xtra Mail answered our made-up xtra.co.nz address with 550 5.1.1 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. Xtra Mail rejected ours, so xtra.co.nz 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.
Xtra Mail is a paid Spark service, closed when unsubscribed
Spark runs Xtra Mail as a subscription service. Cancelling it ends every Xtra Mail address on the account, and a deleted address can only be restored through Spark. Spark's closing checklist says an account can be recovered within 90 days, with fees.
Free Xtra Mail is gone, so an old @xtra.co.nz address in a list may belong to someone who stopped paying. This is a brand whose mail is no longer run by Yahoo, but no Spark page we could read says so, so we do not claim it. Re-confirm older contacts before sending.
Cleaning xtra.co.nz addresses on a list
Because Xtra Mail answers honestly, xtra.co.nz 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 @xtra.co.nz addresses?
- Yes. @xtra.co.nz answers mailbox checks one address at a time. The checker opens an SMTP conversation with xtra.co.nz'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 xtra.co.nz address exists without emailing it?
- Yes. A verifier connects to Xtra Mail's mail server, names the address at the RCPT TO step and disconnects before sending. On 23 October 2026 the server rejected a made-up xtra.co.nz address with "550 5.1.1 User unknown", so a missing mailbox shows up as invalid and the owner receives nothing.
- What mail servers does xtra.co.nz use?
- On 23 October 2026, xtra.co.nz published these MX hosts: mx.xtra.co.nz. You can look them up yourself with the free MX lookup tool.
- Why did a xtra.co.nz 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; Xtra Mail gave a clear rejection for a missing mailbox when we tested it.
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