[Dovecot] User with multiple domains

Hi,

I am running Dovecot on Linux Debian with Exim4 with a number multiple domains.

I have a new user who want to use a single username with more than one domain eg:

test@domainone.com test@domaintwo.com test@domainthree.com

Exim is working fine with mail correctly with mail going to

/home/domainone.com/test/Maildir/new/ /home/domaintwo.com/test/Maildir/new/ /home/domainthree.com/test/Maildir/new/

The Dovecot password files are in

/home/domainone.com/etc/passwd.dovecot /home/domaintwo.com/etc/passwd.dovecot /home/domainthree.com/etc/passwd.dovecot

When trying to retrieve email using Dovecot for test@domaintwo.com the password is not recognised although it is for test@domainone.com.

Help Please

Peter