To this day none of the mail servers I’ve setup can send to verizon.net.
It’s not “hard”, but there are servers who will not accept a single message from you, rDNS, DKIM/SPF be damned. And there’s fuck-all you can do about it.
It’s not “hard”, but there are servers who will not accept a single message from you, rDNS, DKIM/SPF be damned. And there’s fuck-all you can do about it.
If enough users complain, they might change their policies. Ehh, wait, we talk about Verizon here.
Don't bother.