# postconf default_destination_concurrency_failed_cohort_limit
default_destination_concurrency_failed_cohort_limit = 1

After one successful delivery (The following shows the first delivery for 5
recipients has been successful)

Jan 30 11:16:28 mailgw1 postfix-slow/smtp[16362]: connect to
b.mx.mail.yahoo.com[66.196.97.250]:25: Connection timed out
Jan 30 11:16:29 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17: host
g.mx.mail.yahoo.com[209.191.118.103] refused to talk to me: 421 Message from
(161.64.2.15) temporari
ly deferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html
Jan 30 11:16:30 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17: host
g.mx.mail.yahoo.com[206.190.53.191] refused to talk to me: 421 Message from
(161.64.2.15) temporaril
y deferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html
Jan 30 11:16:31 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17: host
e.mx.mail.yahoo.com[216.39.53.1] refused to talk to me: 421 Message from
(161.64.2.15) temporarily d
eferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html
Jan 30 11:16:36 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17:
to=<jacky11287...@yahoo.com.hk>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25,
delay=214, delays=0.11/176/35
/2.3, dsn=2.0.0, status=sent (250 ok dirdel 4/1)
Jan 30 11:16:36 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17:
to=<jacky1128...@yahoo.com.hk>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25,
delay=214, delays=0.11/176/35/
2.3, dsn=2.0.0, status=sent (250 ok dirdel 4/1)
Jan 30 11:16:36 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17:
to=<jacky1128...@yahoo.com.hk>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25,
delay=214, delays=0.11/176/35/
2.3, dsn=2.0.0, status=sent (250 ok dirdel 4/1)
Jan 30 11:16:36 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17:
to=<jacky1128...@yahoo.com.hk>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25,
delay=214, delays=0.11/176/35/
2.3, dsn=2.0.0, status=sent (250 ok dirdel 4/1)
Jan 30 11:16:36 mailgw1 postfix-slow/smtp[16362]: 6EB522EDD17:
to=<jacky1128...@yahoo.com.hk>, relay=d.mx.mail.yahoo.com[66.196.82.7]:25,
delay=214, delays=0.11/176/35/
2.3, dsn=2.0.0, status=sent (250 ok dirdel 4/1)
Jan 30 11:16:36 mailgw1 postfix/qmgr[16150]: qmgr_queue_unthrottle: queue
yahoo.com.hk: limit 1 window 1 success 0 failure 0 fail_cohorts 0
Jan 30 11:16:36 mailgw1 postfix/qmgr[16150]: 6EB522EDD17: removed
Jan 30 11:16:52 mailgw1 postfix/scache[16341]: statistics: start interval
Jan 30 11:13:02
Jan 30 11:16:52 mailgw1 postfix/scache[16341]: statistics: domain lookup
hits=31 miss=10 success=75%
Jan 30 11:16:52 mailgw1 postfix/scache[16341]: statistics: address lookup
hits=0 miss=10 success=0%
Jan 30 11:16:52 mailgw1 postfix/scache[16341]: statistics: max simultaneous
domains=1 addresses=1 connection=3

<=== The above delivery is successful ===>
<=== After destination rate delivery of 300s, the messages getting deferred
and the rest of the messages in active queue are also been deferred ===>

Jan 30 11:21:46 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A: conversation
with g.mx.mail.yahoo.com[209.191.118.103] timed out while receiving the
initial server greet
ing
Jan 30 11:21:50 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A: host
c.mx.mail.yahoo.com[216.39.53.3] refused to talk to me: 421 Message from
(161.64.2.15) temporarily d
eferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html
Jan 30 11:22:20 mailgw1 postfix-slow/smtp[16498]: connect to
b.mx.mail.yahoo.com[66.196.97.250]:25: Connection timed out
Jan 30 11:22:21 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A: host
a.mx.mail.yahoo.com[67.195.168.31] refused to talk to me: 421 Message from
(161.64.2.15) temporarily
 deferred - 4.16.50. Please refer to
http://help.yahoo.com/help/us/mail/defer/defer-06.html
Jan 30 11:22:22 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A:
to=<jacky11287...@yahoo.com.hk>,
relay=g.mx.mail.yahoo.com[206.190.53.191]:25, delay=560, delays=0.14/514
/46/0, dsn=4.0.0, status=deferred (host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please
 refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:22 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A:
to=<jacky1128...@yahoo.com.hk>,
relay=g.mx.mail.yahoo.com[206.190.53.191]:25, delay=560, delays=0.14/514/
46/0, dsn=4.0.0, status=deferred (host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please 
refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:22 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A:
to=<jacky1128...@yahoo.com.hk>,
relay=g.mx.mail.yahoo.com[206.190.53.191]:25, delay=560, delays=0.14/514/
46/0, dsn=4.0.0, status=deferred (host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please 
refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:22 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A:
to=<jacky1128...@yahoo.com.hk>,
relay=g.mx.mail.yahoo.com[206.190.53.191]:25, delay=560, delays=0.14/514/
46/0, dsn=4.0.0, status=deferred (host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please 
refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:23 mailgw1 postfix-slow/smtp[16498]: 78DBD2EDD1A:
to=<jacky1128...@yahoo.com.hk>,
relay=g.mx.mail.yahoo.com[206.190.53.191]:25, delay=560, delays=0.14/514/
46/0, dsn=4.0.0, status=deferred (host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please 
refer to http://help.yahoo.com/help/us/mail/defer/defer-06.html)

Jan 30 11:22:23 mailgw1 postfix/qmgr[16150]: qmgr_queue_throttle: queue
yahoo.com.hk: limit 1 window 0 success 0 failure 0 fail_cohorts 1

<== The above shows fail_cohorts 1 , I think it reach the default value ==>
<== I have restarted Postfix, 

it seems even I put in master.cf
slow      unix  -       -       n       -       1       smtp
        -o syslog_name=postfix-slow
        -o smtp_helo_timeout=10
        -o default_destination_concurrency_failed_cohort_limit=0

or in main.cf
slow_destination_concurrency_failed_cohort_limit = 0

Doesn't take effect but follows the default value instead.
==========>


Jan 30 11:22:23 mailgw1 postfix/qmgr[16150]: qmgr_queue_unthrottle: queue
yahoo.com.hk: limit 1 window 1 success 0 failure 0 fail_cohorts 0
Jan 30 11:22:23 mailgw1 postfix/error[16506]: 9C3E92EDD15:
to=<jacky11287...@yahoo.com.hk>, relay=none, delay=560,
delays=0.05/560/0/0.04, dsn=4.0.0, status=deferred (d
elivery temporarily suspended: host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please ref
er to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:23 mailgw1 postfix/error[16507]: 9CC042EDD1C:
to=<jacky11287...@yahoo.com.hk>, relay=none, delay=560,
delays=0.11/560/0/0.06, dsn=4.0.0, status=deferred (d
elivery temporarily suspended: host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please ref
er to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:23 mailgw1 postfix/error[16508]: C6ACB2EDD20:
to=<jacky11287...@yahoo.com.hk>, relay=none, delay=560,
delays=0.1/560/0/0.05, dsn=4.0.0, status=deferred (de
livery temporarily suspended: host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please refe
r to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:23 mailgw1 postfix/error[16511]: C416B2EDD1B:
to=<jacky11287...@yahoo.com.hk>, relay=none, delay=560,
delays=0.2/560/0/0.09, dsn=4.0.0, status=deferred (de
livery temporarily suspended: host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please refe
r to http://help.yahoo.com/help/us/mail/defer/defer-06.html)
Jan 30 11:22:23 mailgw1 postfix/error[16506]: 9C3E92EDD15:
to=<jacky1128...@yahoo.com.hk>, relay=none, delay=561,
delays=0.05/560/0/0.13, dsn=4.0.0, status=deferred (de
livery temporarily suspended: host g.mx.mail.yahoo.com[206.190.53.191]
refused to talk to me: 421 Message from (161.64.2.15) temporarily deferred -
4.16.50. Please refe
r to http://help.yahoo.com/help/us/mail/defer/defer-06.html)




Victor Duchovni wrote:
> 
> On Thu, Jan 29, 2009 at 05:52:09PM -0800, Jacky Chan wrote:
> 
>> 
>> Thx, I did "postfix reload".
>> How do I verify the _failed_cohort_limit = 0 is been taking effect since
>> postconf doesn't show self-defined transport parameter.
> 
> Just make sure "postconf
> default_destination_concurrency_failed_cohort_limit"
> does produce the default value. Restart Postfix. If the issue persists,
> turn on:
> 
>     destination_concurrency_feedback_debug = yes
> 
> and report the (logged) results.
> 
> -- 
>       Viktor.
> 
> Disclaimer: off-list followups get on-list replies or get ignored.
> Please do not ignore the "Reply-To" header.
> 
> To unsubscribe from the postfix-users list, visit
> http://www.postfix.org/lists.html or click the link below:
> <mailto:majord...@postfix.org?body=unsubscribe%20postfix-users>
> 
> If my response solves your problem, the best way to thank me is to not
> send an "it worked, thanks" follow-up. If you must respond, please put
> "It worked, thanks" in the "Subject" so I can delete these quickly.
> 
> 

-- 
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