Every accountant, solicitor, dentist, vet and estate agent with a website across 16 towns, checked against public DNS on 2026-09-10. Nobody publishes this, so we measured it. Free to read, free to reuse with attribution, and rebuildable for any town on earth with the same four endpoints.
Counted from live MX records, one lookup per domain. 995 of 1332 mail-accepting domains resolve to a provider we recognise; the rest run their own or something uncommon.
| Provider | Domains | Share |
|---|---|---|
| Microsoft 365 | 630 | 63.3% |
| Mimecast | 146 | 14.7% |
| Google Workspace | 124 | 12.5% |
| Proofpoint | 29 | 2.9% |
| IONOS | 28 | 2.8% |
| Barracuda | 19 | 1.9% |
| GoDaddy | 10 | 1.0% |
| Symantec | 5 | 0.5% |
| Zoho | 4 | 0.4% |
| Town | Firms | Accept mail | Bounce | Phone | Checked |
|---|---|---|---|---|---|
| Dublin | 245 | 204 | 41 | 185 | 2026-09-10 |
| Edinburgh | 229 | 208 | 21 | 168 | 2026-09-10 |
| Birmingham | 205 | 191 | 14 | 179 | 2026-09-10 |
| Nottingham | 130 | 113 | 17 | 31 | 2026-09-10 |
| Bristol | 83 | 77 | 6 | 54 | 2026-09-10 |
| Brighton | 82 | 77 | 5 | 47 | 2026-09-10 |
| Glasgow | 79 | 69 | 10 | 53 | 2026-09-10 |
| Cardiff | 71 | 66 | 5 | 52 | 2026-09-10 |
| Newcastle upon Tyne | 69 | 64 | 5 | 38 | 2026-09-10 |
| Leeds | 66 | 62 | 4 | 48 | 2026-09-10 |
| Manchester | 57 | 56 | 1 | 33 | 2026-09-10 |
| Cambridge | 44 | 41 | 3 | 27 | 2026-09-10 |
| Liverpool | 34 | 34 | 0 | 26 | 2026-09-10 |
| Sheffield | 29 | 24 | 5 | 17 | 2026-09-10 |
| Oxford | 26 | 24 | 2 | 12 | 2026-09-10 |
| Southampton | 24 | 22 | 2 | 9 | 2026-09-10 |
141 of these 1473 firms have a live, working website and no MX record at all. Mail to them is discarded before it reaches anyone. They sit in every lead list on the market because almost nobody checks — and each one you mail costs you sender reputation, which is the one thing in cold outreach you cannot buy back.
Same four endpoints, any place and trade on OpenStreetMap. 100 results a day free, no account, no card. Beyond that it is prepaid credits in USDC or XNT and the response hands you a key.
curl -X POST https://apexfaucet.xyz/api/leads/businesses \
-H 'content-type: application/json' \
-d '{"location":"YOUR TOWN","categories":["accountant"],"onlyWithWebsite":true}'
Business listings © OpenStreetMap contributors (ODbL). Mail capability from public DNS MX records — domain level only, never a claim about an individual mailbox. Company-level information only: no named individuals, no personal addresses. Reuse these numbers freely; a link back to this page is the only thing we ask.