I don't disagree. I've been doing it since 2013. I had to call MS support with a little social engineering to get off the o365 blacklist back in ~2015. I just t

I don't disagree. I've been doing it since 2013. I had to call MS support with a little social engineering to get off the o365 blacklist back in ~2015. I just think op's post framing their mass emailing problems as a problem for all mail hosting should be noted as invalid.