[Exim] SMTP auth - mysql

Hello,

I'd like to autenticate useres from diffrent tables in mysql
depending on the domain.
I tried the following:

fixed_plain:
    driver = plaintext
    public_name = PLAIN
    server_condition =  \
      ${if eq {${extract{2}{@}{$2}}} {this.domain} \
      { \
       ${if crypteq {$3} \
         {${lookup mysql{select from this.domain ...}{$value}fail}}}{0}{1} 
\
      }{ \
       ${if crypteq {$3} \
         {${lookup mysql{select from other.domain...}{$value}fail}}}{0}{1}
\
      }}  
    server_set_id = $2

i got from exim:
auth plain AHQjZXhpbTEuZ3Jhei5pbm9kZS5hdABzd3RhY2FkMTQ=
child 16033 ended: status=0xb

if i try this with simple authentfication:

      ${if crypteq {$3} \ 
         {${lookup mysql{select ....}{$value}fail}} \
       {1}{0} }

it worked.

any suggestions?
maby a better way to do this?


Robert