multi email address

From: Luca Beretta (LucaBeretta_at_discussions.microsoft.com)
Date: 10/26/04 

Date: Tue, 26 Oct 2004 03:09:02 -0700

i've some users associated to more than one email address;
when i try to send a new email, it always is sent by default user
email address, but i need to send mail from all user email account, how
can i do ?

thanks