How to correctly switch back to DreamHost Email from Custom MX.
If you are wanting to bring your email messages back, you will have to manually migrate the email messages yourself.
Start by going to your Custom MX Page :
Find your domain, then you will click the “Edit“:
On the next page use the “Regular DreamHost Email“
(the First)Option on the page:
NO OTHER SETTING WILL WORK!
If you were using custom MX, you can set it back this way, and only this way. If you try to add the MX manually (custom MX) it WILL NOT WORK