[zenmac]

Yeah there are shadow blocks on all these major email services. I have just slowly asking my circles to stop using them. And I'm NOT just talking about gmail, Rackspace and ATT as well. (Proton and Tuta are good default for non tech ppl ATM.)

For more regular email user, it is better that one host or find some reliable person or entity that can host your email under domain that your own.