Alias for a domain

[Iñaki]

Hi, my domain in Kolab is "@company.com" but I need to add a domain alias 
called "@otherdomain.com", so if a mail has a recipient like this:

    user1 at otherdomain.com

the mail must be deelivered to:

    user1 at company.com


I think I need to add the following in the template of "main.cf":

  mydestination = company.com  otherdomain.com


But I think that I need to add something in the 
file "/kolab/etc/postfix/canonical":

    otherdomain.com         company.com


Unfortunallety this doesn't work. I've restarted kolab postif and  if I do a 
telnet to 127.0.0.1 and try to send a mail to "user1 at otherdomain.com" there 
appear:

  550 <user1 at otherdomain.com>: Recipient address rejected: User unknown in 
local recipient table


Any help or link? I think I saw this issue in the Wiki but can't find it now.

Thanks a lot for any help.