order email notification

I recently took over managing a web site.  At first on orders, I was getting two emails.  One goes directly to my yahoo address.  The other one is to:ecommerce@domain.com (which is on ionos--and I have a forward to my yahoo email configured on ionos) .  I stopped getting ionos one (to:ecommerce@domain.com).  I can see in the business settings we have from set to ecommerce@domain.com and reply to ecommerce@domain.com.  On the source of the emails, it appears that squarespace is sending the email to yahoo and not ionos.  I would think it should come from ionos?

I have stopped getting duplicate emails and only get the to:me@yahoo.com

There was someone who was also getting notified (they're email is configured in ionos mail forwarding) (they don't have a Squarespace login), but stopped getting them.  They want those order notifications still.

Hope that makes sense and someone might have an idea where  I need to look.