Hola, bueno no se si ya lo solucionastes, pero por si a alguien mas le ayuda copio textual los pasos a realizar de otro post...saludos...
...."for postfix to translate the internaldomain to external domain.
you can begin with the third item if you have done the other items
Edit /usr/share/ebox/stubs/mail/main.cf.mas
Type "cd /usr/share/ebox/stubs/mail"
Type "sudo nano main.cf.mas
Look for this line:
Code:
relayhost = <% $relay %>
Right after this line you must add:
Code:
sender_canonical_maps = hash:/etc/postfix/sender_canonical_maps
Press Ctrl-X and save the changes.
Create /etc/postfix/sender_canonical_maps
Type "cd /etc/postfix"
Type "sudo nano sender_canonical_maps"
Add a line for each user
Code:
username@localhost
username@yourdomain.comPress Ctrl-X and save the changes.
Postmap sender_canonical_maps
Type "sudo postmap /etc/postfix/sender_canonical_maps"
Restart mail / eBox
Now you should restart ebox mail module or just reboot your server.
Restart mail module:
Type "sudo /etc/init.d/ebox mail restart"..