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DNS Lookup Causes Mail to Bounce with Permanent 5.5.4 "Illegal host/domain name found" Error (Doc ID 1675794.1)

Last updated on MAY 16, 2018

Applies to:

Oracle Communications Messaging Server - Version 7.0.4 and later
Information in this document applies to any platform.

Symptoms

MTA is producing a hard failure "Illegal host/domain name found" when it is believed that it should be producing a soft failure such as "host name lookup failure".

Cause

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