Bluewin (Swisscom) is a Swiss ISP mailbox. Across 21,684 Bluewin (Swisscom) addresses verified by BounceZero between April and October 2026, 2.4% were invalid, 0.0% catch-all, 48.4% unknown and 0.4% confirmed valid. Unknown dominates because the gateway defers probes.
Every Bluewin (Swisscom) 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 |
|---|---|---|---|---|---|
| Bluewin (Swisscom) | 21,684 | 2.4% | 0.0% | 48.4% | 0.4% |
| 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 .ch addresses | 30,522 | 9.3% | 0.3% | 36.0% | 19.6% |
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 Bluewin (Swisscom) row: 48.9%.
Swisscom's gateway defers roughly half of probes and confirms almost none as valid, while confirmed invalid is very low. Most results land in the unknown or risky bands, so the verdict columns understate reachability.
Bluewin is Swisscom's consumer mail brand and the default mailbox for Swiss broadband customers. Swisscom's gateway defers most probes and classifies many of the rest into a risky band, so verification confirms very little either way. Swiss law prohibits unsolicited mass email without consent and treats these as personal addresses, and Switzerland sits outside the EU's legitimate-interest framework, so the segment is consent-only regardless of the verification result.
On confirmed-invalid rate, Bluewin (Swisscom) ranks 27 of 29 providers in the corpus, just behind iiNet at 2.8%, ahead of Alice (TIM) at 1.0%.
On unknown rate, Bluewin (Swisscom) ranks 6 of 29 providers in the corpus, just behind Luukku at 49.8%, ahead of BellSouth at 43.7%.
On confirmed-valid share, Bluewin (Swisscom) ranks 28 of 29 providers in the corpus, just behind EarthLink at 1.0%, ahead of BigPond (Telstra) at 0.3%.
How to read these rates: they are BounceZero's probe outcomes on customer lists over April to October 2026, not a census of Bluewin (Swisscom) 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.
Most Bluewin (Swisscom) results are unknown because the gateway defers verification probes. Nothing in that number says the mailboxes are dead; it says email verification alone cannot clear this segment.
Only 2.4% of Bluewin (Swisscom) addresses hard-fail, against 14.5% across non-freemail domains.
Catch-all is negligible on Bluewin (Swisscom) (0.0%); when this provider does return valid, the mailbox accepted the probe itself rather than a blanket accept.
Only 0.4% of Bluewin (Swisscom) 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: 48.9% of Bluewin (Swisscom) 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.
Verification cannot clear Bluewin on its own. Use a warm, low-volume send from a secondary domain and let the bounce report decide. Swiss data protection law treats these as personal addresses.
Role addresses such as info@ and sales@ make up 0.0% of Bluewin (Swisscom) addresses in the corpus. Role addresses are rare here, as expected for a mailbox provider.
2.4% of 21,684 Bluewin (Swisscom) addresses verified by BounceZero between April and October 2026 were confirmed invalid, against 14.5% across non-freemail domains and 17.6% across freemail.
48.4%. Unknown means the mailbox could not be confirmed either way, usually because the gateway deferred the probe. BounceZero refunds unknown results; re-check after a week or use a second channel.
Not in practice: 0.0% of Bluewin (Swisscom) addresses returned catch-all, so a valid verdict means the mailbox exists.
0.4% 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 Bluewin (Swisscom) 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
134,384 BellSouth addresses verified April to October 2026
35,207 BigPond (Telstra) addresses verified April to October 2026
8,450 .br addresses verified April to October 2026
7,561 .ca addresses verified April to October 2026
30,522 .ch addresses verified April to October 2026
6,159 .co addresses verified April to October 2026
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