exim: multiple mailboxes

[Timeboy <timohart@gmx.at>]

Dear Debian Users!

After configuring exim, to send mails to my gmx account timohart@gmx.at, 
i have to do the next step: Cause i have some more mailboxes for my
commercial and private mail, i need to include them into my exim
configuration. An example: My prvate mailbox is *******@gmx.de. In this
case, what i have to do with this?
 
  login:
    driver = plaintext
    public_name = LOGIN
    client_send = ": timohart@gmx.at : ****** "
 
Can i change the last line to:

    client_send = ": timohart@gmx.at : ****** : ********@gmx.de : ******"

or do i have to write a second (login:) authentication?

And which parts of #info exim and #vi /usr/share/doc/exim/spec.txt i
should read to get success?

Timo