Can I find an app for managing multiple email profiles on my e-commerce store?

Hello,

I am trying to set up my e-commerce store with a purchased Shopify domain and use the custom email domain to communicate with other businesses and customers. For example, my primary email is abc@gmail.com, but I would like to use kai@abc.com to send out emails. The standard email feature on Shopify does not allow me to save multiple vendor/business profiles.

Is there an app where it allows me to use both the computer and the phone to save multiple profiles while also sending out and reply emails?