Does a verified email have absolutely 0 chance to "bounce"?

After checking your contacts with our service, if you do not target catch-all configured emails, you will get bounces rates below 5%. So there is still a chance that an email can bouncer.

When the domains provided in your files are Catch all domains, we cannot validate the email addresses we find. These addresses are therefore tagged as non-confirm.

Keep in mind that it is not always possible to verify the existence of an email address. The reason? The catch-all! A company may have configured its mail server to catch-all, which means that the server accepts to receive all the emails in the domain, even if the address does not exist. In this case it will be impossible to know if an email address exists or not. Your emails can end their lives without ever having a reader or even a real recipient, while you continue to relaunch them for nothing...