here is a sample from my log file. It seems like the email is looping on localhost. look at "host".
i made an ln -s postfix-policyd-sf policyd-sender-throttle for cleaner logs. debug is 2 in /usr/local/etc/policyd_sender_throttle.conf
Sep 5 18:11:59 mail postfix-policyd-sf: rcpt=12, greylist=new, host=98.136.44.50 (n66.bullet.mail.sp1.yahoo.com), from=mailuser@yahoo.com, to=mailuser@mydomain.com, size=0
Sep 5 18:11:59 mail postfix/smtpd[5193]: NOQUEUE: reject: RCPT from n66.bullet.mail.sp1.yahoo.com[98.136.44.50]: 450 4.7.1 <mailuser@mydomain.com>: Recipient address rejected: Policy Rejection- Please try later.; from=<mailuser@yahoo.com> to=<mailuser@mydomain.com> proto=SMTP helo=<n66.bullet.mail.sp1.yahoo.com>
Sep 5 18:15:11 mail postfix-policyd-sf: rcpt=13, greylist=abuse, host=98.136.44.50 (n66.bullet.mail.sp1.yahoo.com), from=mailuser@yahoo.com, to=mailuser@mydomain.com, size=0
Sep 5 18:15:11 mail postfix/smtpd[5945]: NOQUEUE: reject: RCPT from n66.bullet.mail.sp1.yahoo.com[98.136.44.50]: 450 4.7.1 <mailuser@mydomain.com>: Recipient address rejected: Policy Rejection- Please try later.; from=<mailuser@yahoo.com> to=<mailuser@mydomain.com> proto=SMTP helo=<n66.bullet.mail.sp1.yahoo.com>
Sep 5 18:18:41 mail postfix-policyd-sf: rcpt=14, greylist=update, host=98.136.44.50 (n66.bullet.mail.sp1.yahoo.com), from=mailuser@yahoo.com, to=mailuser@mydomain.com, size=0
Sep 5 18:18:41 mail policyd-sender-throttle: DEBUG: fd: 8 policy_array[8][7]:sender=mailuser@yahoo.com
Sep 5 18:18:41 mail policyd-sender-throttle: DEBUG: fd: 8 triplet_array[8][1]: mailuser@yahoo.com
Sep 5 18:18:41 mail policyd-sender-throttle: DEBUG: fd: 8 db_charquery(): SELECT _from,_count_max,_count_cur,_date,_quota_cur,_quota_max, _time_limit,_mail_size,_count_tot,_rcpt_max,_rcpt_cur,_rcpt_tot, _log_warn, _log_panic, _abuse_tot FROM throttle WHERE _from='mailuser@yahoo.com' OR _from='@yahoo.com' ORDER BY _priority DESC LIMIT 1
Sep 5 18:18:41 mail policyd-sender-throttle: rcpt=23, throttle=new(a), host=98.136.44.50, from=mailuser@yahoo.com, to=mailuser@mydomain.com, size=2367/15728640, quota=2367/250000000, count=1/100(1), rcpt=1/3600(1), threshold=0|0|0
Sep 5 18:18:41 mail policyd-sender-throttle: DEBUG: fd: 8 db_doquery(): INSERT DELAYED INTO throttle (_date,_from,_quota_cur,_quota_max,_rcpt_max,_mail_size,_count_max,_time_limit) VALUES (1283699921, 'mailuser@yahoo.com', 2367, 250000000, 3600, 15728640, 100, 3600)
Sep 5 18:18:41 mail postfix/qmgr[4498]: 4E28C4D0A81C: from=<mailuser@yahoo.com>, size=2678, nrcpt=1 (queue active)
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 policy_array[12][7]:sender=mailuser@yahoo.com
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 triplet_array[12][1]: mailuser@yahoo.com
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 db_charquery(): SELECT _from,_count_max,_count_cur,_date,_quota_cur,_quota_max, _time_limit,_mail_size,_count_tot,_rcpt_max,_rcpt_cur,_rcpt_tot, _log_warn, _log_panic, _abuse_tot FROM throttle WHERE _from='mailuser@yahoo.com' OR _from='@yahoo.com' ORDER BY _priority DESC LIMIT 1
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 row: 0 data: mailuser@yahoo.com (recieved)
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 row: 0 data: mailuser@yahoo.com (extracted)
Sep 5 18:18:44 mail policyd-sender-throttle: rcpt=25, throttle=update(a), host=127.0.0.1, from=mailuser@yahoo.com, to=mailuser@mydomain.com, size=3125/15728640, quota=5492/250000000, count=2/100(2), rcpt=2/3600(2), threshold=0|1|0
Sep 5 18:18:44 mail policyd-sender-throttle: DEBUG: fd: 12 db_doquery(): UPDATE throttle SET _rcpt_cur=_rcpt_cur+1, _rcpt_tot=_rcpt_tot+1, _quota_cur=_quota_cur+3125, _count_cur=_count_cur+1, _count_tot=_count_tot+1, _abuse_cur=0 WHERE _from='mailuser@yahoo.com'
Sep 5 18:18:44 mail postfix/qmgr[4498]: 486644D0A82F: from=<mailuser@yahoo.com>, size=3305, nrcpt=1 (queue active)
Sep 5 18:18:44 mail amavis[5399]: (05399-12) Passed CLEAN, LOCAL [98.136.44.50] [89.41.134.88] <mailuser@yahoo.com> -> <mailuser@mydomain.com>, Message-ID: <55313.54459.qm@web43515.mail.sp1.yahoo.com>, mail_id: NB9JkuPvf+Kl, Hits: -2.009, size: 2676, queued_as: 486644D0A82F, dkim_id=@yahoo.com,mailuser@yahoo.com, 2363 ms
regards