[horde] How to add IMAP user in headers?

[netty 2006]

Hello,

> > Please let me know how to configure IMP, so all mails sent out of
> > horde contains the IMAP user somewhere in headers. People can create
> > multiple identities and  X-originating-IP cant help for ISPs who run
> > NATed networks.
>
> Auth::getAuth()
>

I cant get it to work. Can you tell me in layman's language where the
changes are to be done?

Regards,
Netty