Returns whether an email address is worth sending to: - Whether it will accept mail. - How confident that is. - Why not, when it will not. - Whether it is a role, disposable, or free-provider address. - What it looks like it was meant to be, when it looks misspelled. One address per call, and one answer: `result` is the field to decide on. Every answer costs the same, including `undeliverable`, which is usually the most valuable one you can get. `result` and `reason` are open vocabularies: the values below are the ones in use today, and further ones may be added. Branch on the values you know and treat anything else as a future value rather than an error. `delivery_confidence` is always present and always comparable, so it is the safe fallback. Send the address in the body rather than the URL when you would rather it did not appear in request logs or browser history. [Look up an email address by URL](/docs/api/reference/get-email-lookup) is the same lookup with the address in the path. Send an `Idempotency-Key` and a retried request returns the stored answer instead of validating the address and charging again. Without one, every attempt is a new lookup and is billed. The email address to look up. Send it exactly as you hold it: the part before the `@` is case-sensitive, so nothing is lowercased for you, and a display-name form such as `Aisha ` is rejected rather than unwrapped. The address that was looked up, exactly as you sent it. Whether the address is well-formed and its domain is set up to receive mail at all. It says nothing about the mailbox itself, so a `valid` domain with no such mailbox is `true` here and `undeliverable` in `result`. How likely mail to this address is to be delivered, from 0 (certain not to be) to 100 (certain to be). Read it alongside `result` rather than instead of it, because the same score can sit under `neutral` or `risky` for different reasons. Notable characteristics of the address. Empty when none apply. Why the address cannot receive mail. Absent unless `result` is `undeliverable`. The address this one looks like a misspelling of. Absent unless a correction was found, which in practice means `result` is `typo`. Offer it to whoever typed the original rather than sending to it unasked, because it is a guess and the address they meant may be neither one.