/etc/postfix/$local_domainname/transport
sudo postmap hash:/etc/postfix/$local_domainname/transport
sudo postmap hash:/etc/postfix/$local_domainname/virtual_alias
/etc/postfix/$local_domainname/transport
sudo postmap hash:/etc/postfix/$local_domainname/transport
sudo postmap hash:/etc/postfix/$local_domainname/virtual_alias