What does each verification mail result mean - Heyluu Mailing

Valid means the server has confirmed the mailbox exists and the email addresses are safe to send.

RISKY (Valid But Risky)
A valid-but-risky result means the email addresses appears to exist, but have quality issues that may result in low engagement or a bounce. Use caution when sending to risky addresses. Accept All, Disposable, and Role addresses are classified as Risky.

Invalid email addresses do not exist, or are syntactically incorrect.

UNKNOWN (Unknown)
Unknown occurs when the server is unable to get a valid response from the recipient's mail server. This usually happens when the destination mail server is too slow or temporarily unavailable. Unknown addresses don't count against your verification balance.

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