Your domain may have a policy of reject or quarantine, but does the receiving host correctly act on that policy?
I can understand if free email providers are more permissive with narrow authentication scenarios. Users aren't usually able to contact support.
As someone suggested in this thread, this is a UX problem.
Policies need to appease a large number of users. A gov/corp org receiving these messages can be more strict. Even in these orgs, people complain about not receiving an email that was appropriately rejected.
I can understand if free email providers are more permissive with narrow authentication scenarios. Users aren't usually able to contact support.
As someone suggested in this thread, this is a UX problem.
Policies need to appease a large number of users. A gov/corp org receiving these messages can be more strict. Even in these orgs, people complain about not receiving an email that was appropriately rejected.