Undeliverable

Invalid Email - Specified email is not a valid email address syntax

Invalid Domain - Domain for email does not exist

Rejected Email - Email address was rejected by the SMTP server, email address does not exist

Invalid SMTP - SMTP server returned an unexpected/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 SMTP server

Timeout - SMTP session timed out or DNS query timed out

Unavailable SMTP - SMTP server was unavailable to process our request

Unexpected Error - An unexpected error occurred

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