Hello  Zhang,
I looked at the source file throttle_sasl.c of policyd 1.8
I'm not sure ... I think that policyd not check the number of recipients in the message and sum always 1.
FROM  throttle_sasl.c:
/* build up & execute query */
  snprintf(mysqlquery_array[fd], 512,
    "UPDATE throttle SET"
    " _rcpt_cur=_rcpt_cur+1,"
   " _rcpt_tot=_rcpt_tot+1,"
    " _quota_cur=_quota_cur+%ld,"
    " _count_cur=_count_cur+%d,"
    " _count_tot=_count_tot+%d,"
    " _abuse_cur=0"
    " WHERE _from='%s'",
    atol(triplet_array[fd][3]),
    instance_inc[fd],
    instance_inc[fd],
    triplet_array[fd][4]);
  if(db_doquery(fd) == -1) return(db_failure(fd, "throttle"));

what do you think?
Thanks

Hello  Zhang,
in my postix/main.cf I have the following destination_recipient_limit:

dovecot_destination_recipient_limit = 1
smtp-amavis_destination_recipient_limit = 1

Thanks

I've rechecked my throttle configuration as you suggested.
Configuration seem ok

What I'm missing?

Thanks