|Result Code||Description||Safe to send?|
|Undeliverable||Not a valid email||No|
|Unknown||Unable to verify||Maybe*|
Email address exist and is accepting emails. This is confirmed by communicating via SMTP. These emails are valid and safe to send mail.
Email address do not exist or is not accepting mails. Sending mails will result in bounce.
Accept-all, also known as 'Catch-all'. These addresses are not verifiable, as their mail server accepts both valid and invalid addresses. So we cannot definitively verify.
We were unable to definitively verify these emails as their mail servers were not reachable during verification. Unknown addresses are checked multiple times from different locations with varying interval before arriving at this result.
These are temporary email address and should not be mailed as there is a very high chance of email bouncing.