Multiple email addresses +Postfix

Hello all,

I have a master/slave Openldap 2.4.9 running on ubuntu server along with Postfix and dovecot. At the moment email server is able to server email for domain1.com with Maildir support for Dovecot at /home/username/ for each user. There is a need to add a 2nd domain let's say domain2.com. My question is where that domain will store the emails as the user home dir is already setup in ldap at /home/username Is there a way to define a new attribute like alternative email and have the same user with same auth details authenticate to both domains like user1@domain1.com and with same pass on user1@domain2.com?

I'm not sure if I'm explain enough the situation, please ask for any clarification if you want to.