Why is email list verification so expensive?

pEmail list verification is one of the most challenging parts of email list hygiene. Everyone want their email list cleaning free, but in this case, you really get what you pay for. Out of the dozens of competitors in this field, all of them know that it’s not easy to verify if an email is a catch-all, soft bounce or hard, and on top of that, report back the exact details of the “kind” of bounce it really is./p