What does the "score" in the result mean?

Short answer: Every verification result includes a score between 0.0 and 1.0 that reflects our confidence that the address is deliverable. Higher is better: closer to 1.0 means we are confident the address is good; closer to 0 means we are confident it is not.

How to read it

The score is best understood together with the status, not on its own:

• valid results carry the highest scores (near 1.0) — a confirmed, deliverable mailbox.
• invalid results carry the lowest scores (near 0) — a confirmed rejection.
• catch-all results sit in the middle. The domain accepts all mail but won't confirm the specific mailbox, so confidence is moderate.
• unknown results carry middling scores that signal "we couldn't confirm this," not "this is good." Do not read an unknown's score as a pass/fail grade.
• disposable results carry low scores — technically reachable for now, but not worth sending to.

Using the score in practice

Treat the score as a confidence dial for building your own send/suppress rules. For example, you might send to everything scored above a threshold you're comfortable with, and hold back or manually review the rest. Where you set that line depends on how conservative you want to be — a transactional email to a paying customer justifies a lower bar than cold outreach at scale.

The score is a guide, not a guarantee. Always pair it with the status and, for borderline cases, your own knowledge of where the address came from.