[imp] two identities

[Andreas Moroder]

Hello,

we have a group of users and all have their own mailbox. We have also a 
common mail address for this office. Most mail are sent from their 
mailboxes but there are also official mails that must be sent from the 
offices mailbox. To solve this we created a mailbox for the office and 
gave the access to all the users.

For incoming mails a alias would solve the problem, but how can we solve 
for outgoing ?
Is it possible to create for everyone of this users a second identity 
they can select when they send a mail ? This identity should have as 
FROM: Text the name of the office. It is also important that the answers 
to this mail come back to the common alias.

Is this possible with horde ?

Thanks
Andreas