DNS MX Record Settings

Hello My domain name [login to view URL] is hosted on my server. Through my server's WHM I have changed the DNS settings so the A Record '[login to view URL]' points to my Shopify Store and I have also changed the CNAME Record 'www.' to point to my Shopify Store. I want my server to continue to handle the mail but it has stopped working since I pointed the domain to Shopify. I need somebody to get the mail working. This is urgent. Thanks.