Is domain authentication needed for multiple stores on one account?

[TreyBrunk]

I currently have 8 operational stores on my account and a few others in development for various clients. I maintain fulfillment/company stores for several of our promotional customers. having to create 4 CNAME records for each store would require creating upwards of 60 records just to keep my shop emails coming from our support email address instead of "no-reply@shopifyemail.com." This seems excessive to me ... Do we really have to create these records, repeatedly (with different values) for each store on the same account?

[MagnifiScent]

Following.  I tried to add the 4 CNAME records.  I copied and pasted exactly as Shopify directions provided.  After waiting 48 hours, my account is updated that it failed to authenticate.  This is definitely NOT my wheelhouse and I am lost.