I am looking for a solution for my brother. He owns a small bar/restuarant,

At the end of every shift, the person who closes for the night sends the numbers to about 15 email address.

This often doesnt go a 100%, the forget a person etc.

I would like to create one email address and auto forward the emails to the 15 other address (MS/ Google / some own domain addresses). If the 15 persons would stay the same for a long time i could create local addressbook entries maybe. But since the personal often changes this would be something that we need to be done often. So no go.

I have access to my own M365 domain, i also have got a SMTP2GO account. I also have docker, Nextcloud, HASS. Maybe something that can be used :)

I could create a distribution list in my M365 portal, but some sites said forwarding like to outside your own domain will hurt your send reputation. Which i believe is indeed the case.

Any ideas on how to do this? A whole other idea is also welcome ofcourse.