[exim] authenticated_sender

Hi,

The docs (http://exim.org/exim-html-current/doc/html/spec_html/ch30.html#SECID146)
say that the authenticated_sender option on the smtp transport is expanded
after the connection is made and TLS established.

Debug ( -s-all+expand_transport ) shows me otherwise. Am I doing something wrong,
misinterpreting the debug output, or does the code not match the doc?

I'm using exim 4.72 but this part of the docs has not changed.

I was testing with:

   # using this purely to get logging of the remote cert
   authenticated_sender = ${if eq {}{\
         ${perl{Exim::log_write}{\
             X${tls_peerdn}X\
         }}}\
         {}{}}

(Yes, log-selector. But I only want the CN).

Cheers,
     Jeremy