Problems while deleting domains with mailusers in subdomains

Hi

I've find out following:

My domain (e.g. default.com) has some subdomains (subservers: dom1.example.com, dom2.example.com, dom3.example.com).

For testing purposes, I've created a mailuser: mail@dom3.example.com. After this, I've deleted exaple.com. Virtualmin has all four domains deleted.

Now I've made again default.com and find out, that he has the mailbox mail.dom3 already (and mailaliases for default@dom1... and default@dom2... which points to default@default.com).

I hope someone understands what I mean, englisch ist not my native language.

Question: Is this a bug, a feature or a missconfiguration?

Thanks...