co-domains and email

hi all
i installed a drupal multisite and added more domains using co-domains option

now i need to create some email for a co-domain... i think this is not possible because email for co-domains are alias of the main domain (is this right?)... is there a way to create a domain and point this on other documentroot? i tried via apache directives but this create two documentroot directives

 

i probably solved creating a new domain with a link from "web" to main domain's web folder

 

yes i know but for example [email protected] is in common with all co-domains and i need an email info@... indipendent for all co-domains (with different password etc...)

 

In that case you must create a web of its onw for each domain in ISPConfig.