iPrimus is an Australian ISP mailbox. Across 29,328 iPrimus addresses verified by BounceZero between April and October 2026, 5.8% were invalid, 0.0% catch-all, 0.0% unknown and 93.9% confirmed valid. The verdicts are reliable and can be acted on directly.
The iPrimus row is all 29,328 addresses verified in the six months to October 2026; the other rows are the benchmarks from the same corpus. Risky and role results fill each row to 100%.
| Segment | Addresses | Invalid | Catch-all | Unknown | Confirmed valid |
|---|---|---|---|---|---|
| iPrimus | 29,328 | 5.8% | 0.0% | 0.0% | 93.9% |
| 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 .au addresses | 560,378 | 36.5% | 6.3% | 17.6% | 37.3% |
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 iPrimus row: 0.3%.
iPrimus answers probes decisively and more than nine in ten addresses confirm valid, the cleanest Australian ISP in the corpus. Its customer base is small and the mailboxes that remain are in active use.
iPrimus is a smaller Australian ISP now part of Vocus, and its mailboxes belong to customers who stayed on the service. The gateway answers clearly and the remaining accounts are in active use, which produces the cleanest Australian ISP segment in the corpus. The domain is small enough that it rarely moves a list's overall numbers; its value is as a counter-example showing that Australian ISP mail can verify well when the provider's gateway cooperates.
On confirmed-invalid rate, iPrimus ranks 21 of 29 providers in the corpus, just behind Hotmail Netherlands at 7.2%, ahead of PeoplePC at 5.6%.
On unknown rate, iPrimus ranks 29 of 29 providers in the corpus, just behind Gmail at 0.0%.
On confirmed-valid share, iPrimus ranks 2 of 29 providers in the corpus, just behind Gmail at 96.0%, ahead of Hotmail at 70.5%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of iPrimus 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 iPrimus: the gateway answers probes clearly, so a result you get is a result you can act on.
Only 5.8% of iPrimus addresses hard-fail, against 14.5% across non-freemail domains.
Catch-all is negligible on iPrimus (0.0%); when this provider does return valid, the mailbox accepted the probe itself rather than a blanket accept.
93.9% confirmed valid makes iPrimus one of the most reachable segments in the corpus. Primary-domain sends are safe at the usual thresholds, and re-verification before every send keeps them that way.
Act on the verdicts. iprimus.com.au is a rare clean Australian consumer segment; it does not predict the rest of an .au list.
Role addresses such as info@ and sales@ make up 0.0% of iPrimus addresses in the corpus. Role addresses are rare here, as expected for a mailbox provider.
5.8% of 29,328 iPrimus addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
0.0%. Unknown means the mailbox could not be confirmed either way, usually because the gateway deferred the probe. BounceZero refunds unknown results; on iPrimus it is rare enough to re-check once and move on.
Not in practice: 0.0% of iPrimus addresses returned catch-all, so a valid verdict means the mailbox exists.
93.9% 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 iPrimus 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
64,161 iiNet addresses verified April to October 2026
7,976 .in addresses verified April to October 2026
1,193,715 .it addresses verified April to October 2026
22,084 Netcom (EarthLink) addresses verified April to October 2026
48,102 Live.nl (Outlook.com Netherlands) addresses verified April to October 2026
104,996 Luukku addresses verified April to October 2026
Continue through related topics