[exim] Ratelimit User per_rcpt

Hi i want to ratelimit some of our Users. I want that they only can send mails to 20
recipients total in one hour. So they can 20 single mails or 2 mail with 10 recipients.
I have a perl function wich make a LDAP lookup for a specific value and if it is not set
the ratlimit should be done for that user and the function returns "false". This is working.
When i delete the ratelimit the user can't send an i see the message in the log.

I tried this configuration but it seems to do nothing.

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

acl_smtp_predata = check_max_recients

check_max_recients:

  deny    condition       = ${if eq{${perl{ldap_check_ratelimit}{$sender_address}}}{false}{yes}{no}}
          ratelimit       = 20 / 1h / per_rcpt / $sender_address
          message         = RATELIMIT EXCEEDED $sender_rate / $sender_rate_period!

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

What is wrong with my configuration?

Regards
Hans
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