When setting up my domain my email stops working

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Hey everyone. I am currently on the trail trying to get a feel for how shopify works. I have tried on two occasions now to set up my domain kglproducts.com and use a2 hosting. Each time I get the domain to forward easily. A2 has a option to set for shopify so its a breeze. BUT both times I have done this my 2 email I have for the website stop functioning. I have read that it has nothing do do with changing the records but its odd that both times changing nothing more than that they just stop working. 

Any ideas?