I searched google and stupid me this is already in the list I apologise for the noise. http://www.dovecot.org/list/dovecot/2006-August/015505.html

On Wed, 2006-10-18 at 15:57 -0500, Todd Johnson wrote:

I have a virtual setup using LDAP where the a user has an email address at 2 domain names. The want the mail kept separate but want to use the same password. I use the mail attribute and insert both email addresses. This works perfectly with deliver but opens the wrong Inbox when I IMAP. Is there a way to disable this in the conf file?

host dovecot: auth(default): auth(jeff@idom.net,::ffff:127.0.0.1): username changed jeff@idom.net -> jeff@jdom.net