For the record, the external symptoms of this issue are (or were for me)
Postfix rejecting every incoming email with a very uninformative
451 4.3.5 Server configuration problem
I was bit by this after I upgraded an Ubuntu server from 10.04 to 12.04.
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https://bugs.launchpad.net/bugs/884743
Title:
--inet=10023 binds to ipv6 only on oneiric
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