I don't have the data, but I believe that sending email from anything other than @gmail.com or @outlook.com is much less likely to arrive.
Maybe the key is that we receive much more email than we send, and that not everything we send is critical.
So perhaps the trick is to keep a @gmail.com or @outlook.com only for sending *must arrive* emails, and do everything else in our domain, with a provider to our liking, or even self-hosted.