Frequently asked questions

In real time, in a few seconds: the format, the domain and the mailbox itself. Each address is also flagged when it is disposable, a role address (info@, support@…), on a free provider or on a domain that accepts any address. You get a clear answer with the reason behind it.

Deliverable: the mailbox exists and accepts email. Undeliverable: the address is malformed, its domain cannot receive email, or the mailbox does not exist. Risky: the domain accepts any address (catch-all) or the address is disposable, so send with care. Unknown: no definite answer this time.

Some domains accept every address, real or not, and sort them out later. Their mailboxes cannot be confirmed, so we report them as risky rather than deliverable: an honest answer instead of a false promise. Yahoo and AOL, for instance, accept every address.

Some email providers answer slowly or ask to come back later. An unknown result says nothing about the mailbox: retry later rather than removing the address. In a list, unknown results are checked again automatically, and you can retry them once more for free from the page of the list.

Yes: upload a CSV, Excel (XLSX) or text file from your dashboard. Duplicates are checked once, and you get your file back with the results added as new columns. With the API, you can send up to 100,000 addresses at once.

Yes, to check one address or a whole list. ValidEmail also works with Make and Zapier.

They are checked live, never compared with a database of collected emails, and never shared or resold. Results and logs are deleted after 30 days.

Rarely: a mailbox can fill up, be disabled or be deleted after the check, and a few providers accept an address and reject the email later. Check your list shortly before sending.