Xtra (Spark) is a New Zealand ISP mailbox. Across 36,082 Xtra (Spark) addresses verified by BounceZero between April and October 2026, 29.0% were invalid, 0.0% catch-all, 3.4% unknown and 11.2% confirmed valid. The verdicts are reliable and can be acted on directly.
Every Xtra (Spark) address BounceZero verified for customers between April and October 2026, beside the corpus benchmarks. The remainder of each row to 100% is risky and role results.
| Segment | Addresses | Invalid | Catch-all | Unknown | Confirmed valid |
|---|---|---|---|---|---|
| Xtra (Spark) | 36,082 | 29.0% | 0.0% | 3.4% | 11.2% |
| All non-freemail domains (business and ISP) | 6,514,884 | 14.5% | 2.3% | 27.0% | 32.6% |
| Business domains only (consumer ISP and freemail excluded) | 1,269,919 | 22.9% | 9.4% | 22.5% | 40.3% |
| All freemail | 1,415,154 | 17.6% | 1.1% | 2.1% | 74.0% |
| All .nz addresses | 36,773 | 28.9% | 0.1% | 3.6% | 11.6% |
Non-freemail includes consumer ISP mailboxes; a business-only cut is on the benchmarks page. Method and every other cut: Lead List Quality Benchmarks 2026. Risky and role on the Xtra (Spark) row: 56.5%.
Xtra is the largest New Zealand consumer mailbox. Three in ten addresses verify as invalid and only about one in ten confirms valid, with a large share landing in the risky band. New Zealand ISP accounts churn with broadband contracts.
Xtra is the consumer mailbox of Spark, New Zealand's largest telecom, and its addresses follow broadband contracts. Spark migrated the service between platforms more than once, which closed dormant accounts and produced a large risky band in verification results. New Zealand's Unsolicited Electronic Messages Act requires consent for commercial email, with a business-relationship exception, so the segment needs a lawful basis before it needs a verification result.
On confirmed-invalid rate, Xtra (Spark) ranks 9 of 29 providers in the corpus, just behind TPG at 30.1%, ahead of SFR at 28.7%.
On unknown rate, Xtra (Spark) ranks 21 of 29 providers in the corpus, just behind iCloud Mail at 4.9%, ahead of Hotmail Australia at 3.1%.
On confirmed-valid share, Xtra (Spark) ranks 21 of 29 providers in the corpus, just behind Luukku at 13.1%, ahead of AOL at 11.0%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of Xtra (Spark) mailboxes. Unknown and catch-all measure what verification could not confirm, which depends on the provider's gateway policy during the window as much as on the addresses. The lists are the ones customers chose to upload, so segments dominated by a few large uploads carry their age and source. Method and limitations: benchmarks page.
Unknown results are rare on Xtra (Spark): the gateway answers probes clearly, so a result you get is a result you can act on.
29.0% of Xtra (Spark) addresses are confirmed invalid, above the 14.5% seen across non-freemail lists. Delete them; there is nothing to re-check.
Catch-all is negligible on Xtra (Spark) (0.0%); when this provider does return valid, the mailbox accepted the probe itself rather than a blanket accept.
Only 11.2% of Xtra (Spark) addresses confirmed as live mailboxes. Those few go to the primary sequence; the segment as a whole is not a cold-email segment.
Note the risky and role share: 56.5% of Xtra (Spark) results landed there, which the four headline columns do not show. Read risky as 'deliverable but with a flag' and test it at low volume before trusting it.
Treat xtra.co.nz as consumer-grade and verify the risky band before sending. For New Zealand B2B lists, the business domains are far more reachable than the ISP addresses.
Role addresses such as info@ and sales@ make up 0.0% of Xtra (Spark) addresses in the corpus. Role addresses are rare here, as expected for a mailbox provider.
29.0% of 36,082 Xtra (Spark) addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
3.4%. Unknown means the mailbox could not be confirmed either way, usually because the gateway deferred the probe. BounceZero refunds unknown results; on Xtra (Spark) it is rare enough to re-check once and move on.
Not in practice: 0.0% of Xtra (Spark) addresses returned catch-all, so a valid verdict means the mailbox exists.
11.2% confirmed valid at verification time. Keep bounces under 2% and complaints under 0.3% on the send, and re-verify the segment before every send.
Upload the file and see valid, invalid, catch-all and unknown per row, with the Xtra (Spark) segment against this benchmark. 100 free checks a month, unknowns refunded.
Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.
Invalid, catch-all and unknown rates per email provider and country domain, 2026
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