[exim] PLAIN authenticator failed... malformed parameter set…

Hello Everyone

I am unable to authenticate my users from public IP adresses.
This is the message when i Try to test my SMTP authentication trought LDAP :
PLAIN authenticator failed for .. (.....com) [192.168.10.2]: 435 Unable to
authenticate at present (set_id=c2RpYXJyYQ==): malformed parameter setting
precedes LDAP URL.



This is the lines in my authentication section, in exim.conf file

######################################################################



LOGIN:

driver = plaintext

public_name = LOGIN

server_prompts = Username:: : Password::

server_condition = ${if ldapauth {user="uid=${quote_ldap_dn:$1},LDAP_USERS"
pass=${quote:$2} ldap:///}{yes}{no}}



server_set_id = $1



PLAIN:

driver = plaintext

public_name = PLAIN

server_prompts = : Username:: : Password::



server_condition = ${if ldapauth
{user="uid=${quote_ldap_dn:$2},LDAP_USERS" pass=${quote:$3}
ldap:///}{yes}{no}}



server_set_id = $2



####################################### > > >





THANKS FOR YOUR HELP !!!