One page per provider and per country domain, each with the invalid, catch-all, unknown and confirmed-valid rates from the addresses BounceZero verified for customers between April and October 2026, a month-by-month cut, why the provider behaves that way, and what to do with the segment. Providers need at least 20,000 addresses to get a page; country domains at least 5,000.
Method, limitations and the aggregate tables: Lead List Quality Benchmarks 2026. Cite as: BounceZero corpus, April to October 2026. Download the table: lead-list-quality-2026.csv (CC BY 4.0).
Sorted by addresses verified. Freemail and ISP mailboxes dominate because business domains are too fragmented to reach the 20,000 threshold individually.
| Domain | Addresses | Invalid | Catch-all | Unknown | Confirmed valid |
|---|---|---|---|---|---|
| T-Online t-online.de | 2,088,148 | 13.9% | 0.0% | 41.2% | 16.4% |
| Alice (TIM) alice.it | 1,178,297 | 1.0% | 0.0% | 2.7% | 64.7% |
| Gmail gmail.com | 801,225 | 3.5% | 0.0% | 0.0% | 96.0% |
| AT&T att.net | 421,292 | 10.1% | 0.0% | 26.4% | 5.8% |
| Hotmail hotmail.com | 253,445 | 16.5% | 0.1% | 0.0% | 70.5% |
| TPG tpg.com.au | 246,811 | 30.1% | 8.9% | 5.1% | 53.9% |
| SBCGlobal sbcglobal.net | 232,302 | 4.6% | 0.1% | 36.3% | 18.0% |
| Telefónica telefonica.net | 159,794 | 42.8% | 0.0% | 8.0% | 48.5% |
| BellSouth bellsouth.net | 134,384 | 4.6% | 0.1% | 43.7% | 15.5% |
| Hotmail Australia hotmail.com.au | 110,452 | 92.7% | 0.0% | 3.1% | 2.3% |
| Luukku luukku.com | 104,996 | 18.3% | 0.0% | 49.8% | 13.1% |
| EarthLink earthlink.net | 65,636 | 10.7% | 0.0% | 86.9% | 1.0% |
| iiNet iinet.net.au | 64,161 | 2.8% | 12.4% | 65.5% | 18.9% |
| Windstream windstream.net | 56,582 | 49.6% | 0.0% | 0.1% | 50.2% |
| iCloud Mail icloud.com | 50,895 | 73.0% | 0.0% | 4.9% | 20.0% |
| Live.nl live.nl | 48,102 | 32.8% | 0.0% | 0.7% | 57.3% |
| Bbox (Bouygues Telecom) bbox.fr | 47,494 | 0.0% | 0.0% | 5.5% | 38.1% |
| MindSpring mindspring.com | 39,022 | 25.6% | 0.0% | 34.8% | 30.3% |
| Optimum optimum.net | 38,181 | 92.9% | 0.0% | 0.8% | 6.0% |
| Xtra (Spark) xtra.co.nz | 36,082 | 29.0% | 0.0% | 3.4% | 11.2% |
| BigPond (Telstra) bigpond.net.au | 35,207 | 8.0% | 0.0% | 87.0% | 0.3% |
| Hotmail Netherlands hotmail.nl | 34,790 | 7.2% | 0.0% | 8.7% | 50.3% |
| AOL aol.com | 33,275 | 17.9% | 24.7% | 19.9% | 11.0% |
| iPrimus iprimus.com.au | 29,328 | 5.8% | 0.0% | 0.0% | 93.9% |
| PeoplePC peoplepc.com | 25,971 | 5.6% | 0.0% | 85.8% | 2.5% |
| SFR sfr.fr | 25,403 | 28.7% | 0.0% | 16.8% | 42.2% |
| Netcom ix.netcom.com | 22,084 | 32.0% | 0.0% | 35.5% | 29.1% |
| Bluewin (Swisscom) bluewin.ch | 21,684 | 2.4% | 0.0% | 48.4% | 0.4% |
| Yahoo Mail yahoo.com | 21,081 | 8.3% | 27.7% | 39.0% | 16.4% |
Country-code and generic top-level domains with at least 5,000 addresses.
| Domain | Addresses | Invalid | Catch-all | Unknown | Confirmed valid |
|---|---|---|---|---|---|
| .com com | 2,158,955 | 16.4% | 4.4% | 14.7% | 59.7% |
| .de de | 2,095,440 | 13.9% | 0.0% | 41.2% | 16.5% |
| .net net | 1,252,193 | 17.7% | 0.6% | 28.8% | 19.9% |
| .it it | 1,193,715 | 1.3% | 0.0% | 3.2% | 64.2% |
| .au au | 560,378 | 36.5% | 6.3% | 17.6% | 37.3% |
| .fr fr | 119,582 | 12.1% | 0.5% | 9.3% | 47.6% |
| .fi fi | 100,516 | 4.6% | 0.2% | 22.1% | 59.6% |
| .nl nl | 87,309 | 21.9% | 0.2% | 4.5% | 54.6% |
| .org org | 56,401 | 24.6% | 12.4% | 25.0% | 36.2% |
| .nz nz | 36,773 | 28.9% | 0.1% | 3.6% | 11.6% |
| .ch ch | 30,522 | 9.3% | 0.3% | 36.0% | 19.6% |
| .be be | 28,040 | 4.6% | 0.5% | 49.5% | 40.5% |
| .uk uk | 21,194 | 17.0% | 3.7% | 10.6% | 65.0% |
| .edu edu | 17,961 | 32.8% | 8.3% | 18.5% | 38.2% |
| .ae ae | 16,114 | 10.8% | 1.8% | 14.9% | 47.7% |
| .at at | 15,222 | 8.5% | 1.5% | 29.1% | 53.4% |
| .us us | 10,998 | 34.1% | 13.6% | 21.9% | 29.1% |
| .se se | 10,158 | 2.0% | 0.8% | 2.9% | 92.0% |
| .br br | 8,450 | 15.3% | 12.7% | 12.0% | 58.5% |
| .in in | 7,976 | 10.7% | 18.3% | 22.7% | 44.2% |
| .ca ca | 7,561 | 15.9% | 6.2% | 13.9% | 54.4% |
| .co co | 6,159 | 17.1% | 25.6% | 15.3% | 38.7% |
| .gov gov | 5,866 | 24.7% | 18.0% | 22.1% | 34.7% |
Upload a list and get the same four results per address. 100 free checks a month, bulk jobs to a million rows, unknowns refunded.
Verify My List - FreeAyoub 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.