1) Create a user in the control panel
2) Login through shell and get into user’s /var/spool/mail/ ie. /home/virtual/domain_name/var/spool/mail/
3) You will get a symlinks for the user
Eg: If there is a user test with main domain abc.com you get
test@abc.com —> test –corresponds mail
test#abc.com —> test –corresponds ssh
4) You need to change the main domain symlink to additional domain
Eg: Suppose the additional domain is “pqr.com” change the links to
test@pqr.com —>test
test#pqr.com —>test
5) This will create a mailbox for test@pqr.com