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As I kown,for performance,Lotus Domino will get the DNS blacklist from the DNS blacklist sites and save it in memory.

So,it is not real time?

For example:

2016/08/30 09:37:46 SMTP Server: iZ28mxuzo2dZ (27.75.142.47) connected

2016/08/30 09:37:49 SMTP Server: 41.225.94.52 connected

2016/08/30 09:37:49 SMTP Server: iZ28mxuzo2dZ (27.75.142.47) disconnected. 1 message received

But the query result from spamhaus.org is as below:

IP Address 27.75.142.47 is listed in the CBL. It shows signs of being infected with a spam sending trojan, malicious link or some other form of botnet.

It was last detected at 2016-08-30 04:00 GMT (+/- 30 minutes), approximately 1 hours ago.

This IP is infected (or NATting for a computer that is infected) with the necurs spambot. In other words, it's participating in a botnet. If you simply remove the listing without ensuring that the infection is removed (or the NAT secured), it will probably relist again.

My question is : is it not real time or How long it updates?

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A possible option to find out the time will be to enables debug of DNS Blacklist lookups:

SMTPdebugcontrols = 3
SMTPdebugDNSBL=1

More infos here and here.

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