[OT] Saving outgoing email Gmail style

[Mihira Fernando <mihiratheace@gmail.com>]

With Gmail, when you send email using their smtp server, a copy of the mail 
gets saved in the 'Sent' folder in the Gmail web interface. 
Does anyone know how this is done ? OR how to achieve the same result using 
Postfix ?
My goal is to setup email backups with a web interface for my virtual mailbox 
users so that they can get a copy of their mail both received and sent in 
their Inbox and sent folders respectively.

I'm using Postfix 2.3.8 and Dovecot on Debian Etch and all my users are 
virtual users.

Thanks in advance,

Mihira.
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