I am confused about what exactly this means if we just have a personal domain for my professional emails. Which are just a couple a day at a max (really depends on if I am looking for a new job or not).

Does this make having email accounts like this viable anymore? Am I at risk of my emails not getting where I expect them too, particularly important if I am looking for a new job?

I use Amazon WorkMail so will need to see if that has done what is necessary, but still worried what exactly this will mean.

Edit: Is there a tool to validate that things are setup how we need it to be?