[Dovecot] .'s in folder names

Hi there

We are trying to move over from 1 IMAP server to another, but the problem is dovecot does not allow .'s in folder names (and we have quite a number of people who do have .'s in their folder names (ie "www.domain stuff")

Is there anyway of allowing dovecot to allow .'s in folder names?

Thanks Craig Whitmore