[exim] Addid RBL Checks : NEED HELP

Hello Friends,

I am a new bee to exim and need some help from the experts. Following is my
Exim conf, I want to add RBL checks at SMTP Level. Please let me know what
lines should be added where?

Thanks in Advance.

######################################################################
#                       ACL CONFIGURATION                            #
#         Specifies access control lists for incoming SMTP mail      #
######################################################################
begin acl

acl_check_conn:
accept hosts = * : 127.0.0.1


acl_check_rcpt:

  accept  hosts = :
  deny    domains       = +local_domains
          local_parts   = ^[.] : ^.*[@%!/|]
  deny    domains       = !+local_domains
          local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./
  deny    hosts  = HOSTBLACKLIST
          message       = blacklisted host: $sender_host_address
  deny    senders = SENDERBLACKLIST
          message = blacklisted sender: $sender_address
  require verify        = sender

  deny    domains       = +domains_to_callout
          !verify        = recipient/callout=10s,defer_ok
  defer
          message       = $sender_host_address is not yet authorized to
deliver \
                          mail from <$sender_address> to <
$local_part@$domain>. \
                          Please try later.
          log_message   = greylisted.
          !spf          = pass
          !senders      = :
          !hosts        = : +relay_from_hosts : \
                            ${if exists
{/usr/mailserver/etc/greylistd/whitelist-hosts}\

{/usr/mailserver/etc/greylistd/whitelist-hosts}{}} : \
                            ${if exists
{/var/mailserver/spool/greylistd/whitelist-hosts}\

{/var/mailserver/spool/greylistd/whitelist-hosts}{}}
          domains       = +domains_to_greylist
          !sender_domains = +domains_to_avoid_greylist
          condition     =
${readsocket{/var/mailserver/run/greylistd/socket}\
                                 {--grey \
                                  $sender_host_address \
                                  $sender_address \
                                  $local_part@$domain}\<$local_part@$domain%7D\>
                                 {5s}{}{false}}

  accept  domains       = +relay_to_domains
          endpass
      verify        = recipient
  accept  hosts         = +relay_from_hosts
  accept  authenticated = *
  deny    message       = relay not permitted