[exim] Exim / Dovecot and AUTH LOGIN

|   plain:
|     driver = dovecot
|     public_name = PLAIN
|     server_socket = /var/run/dovecot/auth-client
|     server_set_id = $auth1
|   
|   login:
|     driver = dovecot
|     public_name = LOGIN
|     server_socket = /var/run/dovecot/auth-client
|     server_set_id = $auth1

|   service auth {
|     # auth_socket_path points to this userdb socket by default. It's typically
|     # used by dovecot-lda, doveadm, possibly imap process, etc. Its default
|     # permissions make it readable only by root, but you may need to relax these
|     # permissions. Users that have access to this socket are able to get a list
|     # of all usernames and get results of everyone's userdb lookups.
|     # unix_listener auth-userdb {
|       #mode = 0600
|       #user =
|       #group =
|     # }
|   
|     # Exim SMTP AUTH
|     unix_listener auth-client {
|       mode = 0660
|       user = exim
|       group = exim
|     }