How do i set mailboxes for domain aliases?

[cyberfrosch]

Hello,

I have one domain with physical hosting: web1.mydomain.com

Then there are 2 domain aliases:
- germany.mydomain.com
- italy.mydomain.com
wich lead to web1.mydomain.com

I have chosen aliases for my website, because the content and language(english) should be the same. And when I type in "italy.mydomain.com" in my Browser there should be "italy.mydomain.com" instead of "web1.mydomain.com" (when you use Forwarding).

Now I want to have a:
- [email protected]
- [email protected]

These email-Adresses should own a single mailbox each.

I have no idea how to realize that. Perhaps you have another solution for the problem "mailboxes for aliases".