You can use Ok emails and, in some cases, Risky emails (Unknown and Catch-all). For email marketing, it is also recommended to filter out role emails.
Good Emails
Ok means the email address exists, and it is safe to send emails to. MillionVerifier offers a 100% money-back guarantee on Ok emails.
Risky Emails
You can use risky emails only if:
they are real subscribers (not purchased list, nor collected from the internet)
they have subscribed recently (less than two months ago)
Risky emails fall into two categories:
Unknown: This means that we couldn't verify the email address at the time of the verification.
Catch all: This means the email server is set to accept all mail even if the email account doesn't exist.
You can try verifying the Unknown emails again later, and you might get the results of them, if the previous problem doesn't occur, and we can verify the email addresses.
Bad Emails
Never use bad emails. Bad emails fall into two categories:
Invalid: This means the email account doesn't exist.
Disposable: This means the email address is just a temporary email address.
