A mailbox or mail alias with the same name and domain already exists

Hi!

Pleas help me this problem:

I install the virtualmin latest GPl on CentOS5.4 .... install successfull.

Create new virtual server... all options ok.

Create one admin email: username@userdomain.net And add email alias: alias1@userdomain.net

...

alias1@userdomain.net not working, email daemon send: user not restrcetd on userdomain.net ...

re-virtualmin full, and create again the virtualmin....create virtualserver: userdomain.net Probaly adding alias1@userdomain.net -> ERROR.

Error message: "A mailbox or mail alias with the same name and domain already exists"

How can manualy delete old registration records on e-mail users, aliases, etc?

Pleas help me how can list all email users, aliases..etc and delete-reset this?

Thanks

joinfok@gmail.com

Balazs