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Understanding the results

How do you define each verification category? (Deliverable, undeliverable, risky etc.)

These are the 5 different categories you will find once the verification is complete:

Deliverable - We can determine with a high level of confidence that the email address is associated with a valid account.
Undeliverable - We can determine with a high level of confidence that the email address is not associated with a valid account.
Risky - Emails are deliverable, but should be used with caution due to low quality or deliverability. May include Accept All, Disposable, and Role addresses.
Unknown - The domain associated with the email address is not responding, meaning we cannot determine the validity of the email account.
Duplicate - The list contains more than one of the same email.

What are the possible states and reasons for verification results?

Deliverable

Accepted Email: Email address exists and is deliverable.

Undeliverable

Invalid Email: Email address does not pass syntax validations.
Invalid Domain: Email address domain does not exist or is not valid.
Rejected Email: Email address was rejected by the mail server because it does not exist.
Invalid SMTP: Mail server returned an unexpected or invalid response.

Risky

Low Quality: Email address has quality issues that may make it a risky or low value address.
Low Deliverability: Email address appears to be deliverable, but deliverability cannot be guaranteed.

Unknown

No Connect: Could not connect to mail server.
Timeout: Mail server session or DNS query timed out.
Unavailable SMTP: Mail server was unavailable to process our request at this time.
Unexpected Error: An unexpected error occurred.

What do the numbers next to each email address on my list mean?

Each email verified is given an email quality score, ranking it's deliverability on a scale from 0 - 100.
The numbers also correspond with a deliverability category:

0 = Undeliverable
1 - 79 = Risky
80 - 100 = Deliverable.

How are duplicate emails handled in verification?

Each verification request is processed independently and every email address is reverified regardless of past knowledge. You will be charged for every email verification request, regardless of whether the email has been previously verified with our system.

However, if the duplicate emails are in the same list, you will not be charged twice.
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