Ben C. In simple terms, a catch-all email is an email that is set up to receive any email sent to a domain, even if the specific email address doesn't exist.
A SMTP based verifier like Neverbounce, Zerobounce or Debounce can't verify if the mailboxes on catch-all domains exist or not until they send them actual emails.
If all your prospects are important, then you can verify them using Scrubby (although a bit expensive). Scrubby sends them actual emails using burner accounts to see if they bounce or not. If they bounce back, they count them as invalid, otherwise mark them as valid.
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