[Dovecot] User with multiple domains

[Peter Sparkes]

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 at domainone.com
test at domaintwo.com
test at 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 at domaintwo.com the 
password is not recognised although it is for test at domainone.com.

Help Please

Peter