I bought a Domain for hotstinger, connected it to my shopify store it work for a month then all of it sudden it just disconnected while I paid for a year I've have tried connecting it back the same way I did the first time. Putting my A record and CN...

 My shopify email is register with a custom Domain but when I send my emails  recipients will see it at store + 69326471404@shopify.com and I don't want that. I want it to be my store email and my store email is the same email I registered my domain ...