Re-created a virtual mail server relaying mail to alias addresses on our current server just like in my previous posts
Just had to do postmap /etc/postfix/virtual after the cf file etc update. This new machine did not start refusing emails for krishna.radiosai.org after adding the virtual domain. Added appropriate firewall rules to the gateway, of course. Just a note: in /etc/postfix/main.cf,
mynetworks = 127.0.0.0/8
does not need to be changed. Changing this is only required if you want the postfix to relay mail (without auth, for third-party domains - an open relay!) from some other ip address also.