Contact data verification
MobiusEngine · every address checked before a single email is sent
242,856
unique addresses verified
81.2%
confirmed deliverable
Stage 1 · from your file to a clean address list
Rows with an email
219,998
Unique addresses
215,117
4,881 duplicate addresses removed. The same person twice is still one send.
Plus earlier batches
242,856
Combined with the lists sent earlier, de-duplicated across all of them.
Stage 2 · what verification found
| Result | What it means | Addresses | Share |
|---|
| Deliverable |
Mailbox confirmed to exist and accept mail. |
197,247 | 81.2% |
| Catch‑all |
The company's mail server accepts everything and confirms nothing, so no tool can prove the individual mailbox. Common at large employers. Not a data quality problem. |
37,642 | 15.5% |
| Undeliverable |
Mailbox does not exist. These would hard‑bounce. |
7,222 | 3.0% |
| Temporary failure |
Server was unreachable at the time of checking. All 1,246 were re‑checked: 293 came back deliverable, 208 as catch‑all, 745 still unresolved. |
745 | 0.3% |
This is why your earlier check showed around 1%. 58.9% of these addresses sit on
catch‑all domains and 55.9% sit behind corporate security gateways. A single‑pass
validator cannot confirm a mailbox on those domains, so it reports them as undeliverable.
Ours runs a second pass that resolves most of them. Same data, different result.
Stage 3 · what we will actually send to
| Segment | Treatment | Addresses |
|---|
| Main campaigns |
Confirmed deliverable. Sent in order of confidence, starting with the strongest. |
191,199 |
| Test campaign |
Catch‑all addresses, sent as a separate campaign on separate infrastructure so we measure their real bounce rate without risking the main send. |
37,094 |
| Held back |
Group aliases and personal mailboxes. Kept, not deleted. |
713 |
| Excluded |
Domains whose security gateway blocks cold mail outright. |
6,224 |
| Removed |
Confirmed dead. Sending to these damages the sending domains. |
7,033 |
Stage 4 · deliverability by employer
| Company domain | Addresses | Deliverable | |
|---|
| ngc.com | 21,278 | 98.9% | |
| capitalone.com | 10,686 | 34.0% | |
| usbank.com | 6,547 | 84.5% | |
| schwab.com | 5,867 | 91.6% | |
| pnc.com | 5,057 | 97.9% | |
| lmco.com | 4,180 | 2.0% | |
| epic.com | 3,913 | 83.8% | |
| charter.com | 3,315 | 96.4% | |
| pge.com | 3,162 | 97.7% | |
| blueorigin.com | 3,162 | 95.2% | |
| truist.com | 2,799 | 88.3% | |
| principal.com | 2,630 | 99.1% | |
lmco.com and capitalone.com are catch‑all, not bad data. Their servers accept
mail for any address and confirm nothing, which is why the confirmed share looks low.
Those addresses go into the test campaign rather than being thrown away.