[exim] how to get the email address of the sender?

[Angelo Chen via Exim-users]

Hi,

I'm trying to set up a gmail relay:

this works:

begin authenticators

gmail_login:
    driver = plaintext
    public_name = LOGIN
    client_send = : myn...@gmail.com : paspaspas

but that is hard coded to be one user, I like the email address part to be
a variable:

begin authenticators

gmail_login:
    driver = plaintext
    public_name = LOGIN
    client_send = : {$sender_address} : paspaspas

this does not work, any idea? Thanks,
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