These days making sure email gets through is about jumping through a huge amount of hoops and having a long term "trusted" track record at the domain level, ip

These days making sure email gets through is about jumping through a huge amount of hoops and having a long term "trusted" track record at the domain level, ip level, etc. Spammers have gotten good, and because of that anti-spam efforts have had to increase their restrictiveness over time. Because of this reliably getting email out of your network and into another inbox is anything but trivial these days.