[Exim] Possible FAQ entry: SMTP-auth with courier-authdaemon

Hi there,

I think that this is something which should probably be added to the FAQ,
since many People are using Courier IMAP in conjunction with the Exim-Mailer
to set up a complete email server solution.

Usually they don't want to use other Passwords for SMTP-auth than with
POP3/IMAP. Thus exim needs to use the Courier authdaemon for SMTP-auth.

This is the Solution for PLAIN and LOGIN authenticators which works for me
(Credits go to Brian Candler for pointing me to the right direction).

Probably a more elegant way to solve this Problem would be the use of
embedded perl, which would allow to remove the \n hack.

# This Authenticator is used by M$OE
# user "mail" needs to be able to access
# /var/run/courier/authdaemon/socket
login:
driver = plaintext
    public_name = LOGIN
    server_prompts = Username:: : Password::
    server_condition = \
    ${if eq {${readsocket{/var/run/courier/authdaemon/socket}{AUTH 76\n${length_76:exim\nlogin\n$1\n$2\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n}}}}{FAIL\n} {no}{yes}}
    server_set_id = $1

# This Authenticator is used by Netscape/Mozilla
# user "mail" needs to be able to access
# /var/run/courier/authdaemon/socket
plain:
  driver = plaintext
  public_name = PLAIN
  server_condition = \
    ${if eq {${readsocket{/var/run/courier/authdaemon/socket}{AUTH 76\n${length_76:exim\nlogin\n$2\n$3\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n}}}}{FAIL\n} {no}{yes}}
  server_set_id = $2

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