Valid, Probably valid, Catch-all and Not found
What the four email levels mean, what is charged and how to use catch-all addresses.
Updated
Every email Preb returns is verified and gets one of three levels. You see them as markers next to the address, as chips above the table, in the summary cards and in the status columns of the download. A fourth state, Not found, means no address was returned.
| Level | Meaning | Estimated bounce rate | Charged |
|---|---|---|---|
| Valid | The mailbox was confirmed and accepts email. Safe to send. | Below 2% | Yes |
| Probably valid | The domain accepts every address, but three independent checks found positive signals for this mailbox. Very likely to reach the inbox. | Around 9% | Yes |
| Catch-all | The domain accepts every address, even for mailboxes that do not exist, so this one could not be confirmed. | Between 26% and 40% | Yes |
| Not found | No address with enough confidence. Nothing is returned for this field. | No |
Should I send to catch-all addresses?
Most of them work. If you use a sending tool, send to catch-all addresses in smaller batches and keep an eye on bounces, so that your sender reputation stays healthy. Downloading only Valid emails (valid and probably valid) is the safest choice for large campaigns, Catch-all emails is a separate download for a careful second wave.