[exim] help with authenticators.

I have this authenticator which take the full email address as
login. I use the domain name as a key for my lookup. All the
authentication process works fine but the variable authenticated_id is
"qualified", and quotes are added by exim.

Ex: "fred@???

This string also ends up on the header of the mail in the header of
the mail send in the Sender, and the Return-Path field.

Return-Path:     <fred@???@xcp.bsdhost.net>
Sender:     "fred@???

cram:
   driver = cram_md5
   public_name = CRAM-MD5
   server_secret = ${lookup{${local_part:$1}}lsearch\
         {/space/hosting/${domain:$1}/etc/passwd.cram}\
         {${sg{$value}{\{plain\}}{}}}{fail}}
   server_advertise_condition = ${if eq{$tls_cipher}{}{}{*}}
   server_set_id = $auth1

How can I set authentication_id with the right value ?

-fred-


--
Fred C!
PGP-KeyID: E7EA02EC3B487EE9
PGP-FingerPrint: A906101E2CCDBB18D7BD09AEE7EA02EC3B487EE9