Issue Greylisting rejected a message for hours

[H9k]

I just had a complaint about a message that was delivered with a delay of about 10 hours.
Looking at the logs, this is what i found:

Aug 29 16:13:26 pulsar postfix/smtpd[30550]: F24577A0ABD: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 16:15:36 pulsar postfix/smtpd[30748]: B29667A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 16:26:08 pulsar postfix/smtpd[30748]: 5189B7A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 17:04:29 pulsar postfix/smtpd[16489]: 4822D7A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 18:15:15 pulsar postfix/smtpd[16558]: 772677A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 20:16:07 pulsar postfix/smtpd[1176]: 96FE17A0ABD: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 29 22:16:47 pulsar postfix/smtpd[26438]: 2AAFF7A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>
Aug 30 00:17:27 pulsar postfix/smtpd[5376]: 309097A0A99: milter-reject: DATA from mail.senderdomain.com[91.186.x.x]: 451 4.7.1 Service unavailable - try again later; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mail.senderdomain.com>

Only at 2am the message eventually got accepted.
As you can see it always was being sent from the same server and same IP address.
The greylisting config shows the following

Grey listing checking enabled
Grey interval 5 minutes
Expire interval 51840 minutes
Penalty interval 2 minutes
Penalty disabled
Personal grey listing
configuration allowed

So it is my understanding that at the 16:26 attempt the message should have been accepted, but it was not.
Any ideas as to what the cause could be?

 

[H9k]

This thread was marked as resolved... was it by accident or was it a bug that has been fixed?