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DNSRBL (Real-time Blackhole List) Rejections on MMP Stop Working When Under Production Load (Doc ID 2441650.1)

Last updated on APRIL 19, 2021

Applies to:

Oracle Communications Messaging Server - Version 8.0.2 and later
Information in this document applies to any platform.


DNS Realtime Blackhole List (RBL) check for incoming POP and IMAP connections may fail to work when MMP systems are under production load.  Although, the lookup succeed and the client can be denied appropriately when the load is reduced,

Sample entry in transactlog, where we do not see any "rr" at the end of the transaction:

For instance, new in Messaging Serve (MMP only), XML log attribute 'rr' refers to the
 reason a connection was rejected.





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