Telefónica is a Spanish ISP mailbox (legacy Terra and Movistar). Across 159,794 Telefónica addresses verified by BounceZero between April and October 2026, 42.8% were invalid, 0.0% catch-all, 8.0% unknown and 48.5% confirmed valid. The invalid share is far above the business average.
Every Telefónica 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 |
|---|---|---|---|---|---|
| Telefónica | 159,794 | 42.8% | 0.0% | 8.0% | 48.5% |
| 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 .net addresses | 1,252,193 | 17.6% | 0.6% | 28.8% | 19.9% |
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 Telefónica row: 0.8%.
Telefónica consumer addresses were issued with Terra and early Movistar broadband and most are no longer in use. Four in ten verify as invalid, the highest confirmed-invalid rate of any large ISP in the corpus. The gateway answers clearly, so the number is reliable.
Telefónica issued these addresses to Spanish broadband customers in the Terra and early Movistar years and later encouraged migration to other mailboxes, which is why so many are closed. Spanish B2B lists that include telefonica.net were typically compiled from company registers and directories where sole traders listed a personal ISP address. Spain's LSSI requires prior consent for commercial email to individuals, and the regulator AEPD enforces it, so the surviving addresses are rarely a lawful cold target.
On confirmed-invalid rate, Telefónica ranks 5 of 29 providers in the corpus, just behind Windstream at 49.6%, ahead of Live.nl at 32.8%.
On unknown rate, Telefónica ranks 17 of 29 providers in the corpus, just behind Hotmail Netherlands at 8.7%, ahead of Bbox (Bouygues Telecom) at 5.5%.
On confirmed-valid share, Telefónica ranks 9 of 29 providers in the corpus, just behind Windstream at 50.2%, ahead of SFR at 42.2%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of Telefónica 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.
Telefónica rarely returns unknown. When it does, re-check once; a second unknown usually means a dormant mailbox.
42.8% confirmed invalid is far above the 14.5% business average. A list with many Telefónica addresses was compiled a long time ago.
Catch-all is negligible on Telefónica (0.0%); when this provider does return valid, the mailbox accepted the probe itself rather than a blanket accept.
48.5% of Telefónica addresses confirmed as deliverable at verification time and can go straight to the primary sequence, with a re-check before every send.
Expect to discard close to half of telefonica.net addresses. Lists that carry many of them are old; verify the whole list before paying for it, not just this segment.
Role addresses such as info@ and sales@ make up 0.0% of Telefónica addresses in the corpus. Role addresses are rare here, as expected for a mailbox provider.
42.8% of 159,794 Telefónica addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
8.0%. Unknown means the mailbox could not be confirmed either way, usually because the gateway deferred the probe. BounceZero refunds unknown results; on Telefónica it is rare enough to re-check once and move on.
Not in practice: 0.0% of Telefónica addresses returned catch-all, so a valid verdict means the mailbox exists.
48.5% 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 Telefónica 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
25,403 SFR addresses verified April to October 2026
2,088,148 T-Online addresses verified April to October 2026
246,811 TPG addresses verified April to October 2026
21,194 .uk addresses verified April to October 2026
10,998 .us addresses verified April to October 2026
56,582 Windstream addresses verified April to October 2026
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