For example, you would like to change your root@localhost with admin@mydomain.com.

In /etc/postfix/main.cf, add :

canonical_maps = hash:/etc/postfix/canonical

In /etc/postfix/canonical, add :

root admin@mydomain.com

Then do :

postmap /etc/postfix/canonical

/etc/init.d/postfix restart

Seems to be an issue with this mouse since the version 9.04: even though gnome bluetooth interface can scan the device, the paring is not done.
Solution: install backward compat packages:

sudo apt-get install bluez-compat

Then put your mouse in paring mode and:

sudo hidd -s