This means that the domain associated with the email has the policy to report any email on the domain as valid, so Hunter cannot verify if the email is currently deliverable or not. Due to this, these emails are marked as "accept all" in Hunter.
For example, the domain “hubspot.com” is one of these types of domains. So, if we check firstname.lastname@example.org we will always receive an “OK” response for any mailbox. This is why we cannot be sure the emails associated with them are valid.
Are accept all emails safe to send?
Accept all emails may still bounce, so whether you want to send them or not depends on the bounce rate you are willing to have.
In general, the bounce rate of the accept-all emails in your list is around half the invalid rate of your full list. For instance, if 10% of the emails in your list are invalid, around 5% of the accept all emails in the list may bounce.
Some email service providers (ESP) will have different tolerances in bounce rates. If you have a dedicated email server with your own IP addresses, accept all emails may be safe to send. If you rely on a third-party service to send emails, it may have a stricter bounce rate limitation and it may be a good idea to remove accept all emails from your sending list.
What can I do?
To maximize your results for accept-all emails, we suggest filtering emails with a 93 - 94% confidence score and gradually decreasing it based on the bounce rate.
Follow this step-by-step guide for a few things to look at to make your decision on whether to use accept-all emails.