My daughters have verizon email and receive inappropriate emails. I have posed this question several times to Verizon and they tell me someone will call me back to resolve which never happens.
I want to block all email except from senders I approve. A whitelist only at the server side.
This cannot be that difficult.
the webmail has a block list and safe list that you can setup.... as well as other rules....
they are limited, but it sounds like that may be what you are looking for....
getting spam is all part of having an email address...