Deliverable

Accepted Email: Email address exists and is deliverable.

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.

Undeliverable

Invalid Email: Email address does not pass syntax validations.
Invalid Domain: Email address domain does not exist, is not valid, or should not be mailed to.
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.

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.
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