It's not bulletproof on an IPv6 host. I think if you can't resolve
localhost you have bigger problems.
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https://bugs.launchpad.net/bugs/948320
Title:
main.cf should not refer to localho
Public bug reported:
The postfix package distributes a main.cf configuration file that refers
to localhost in at least one of the parameter settings. Instead, it
should use localhost's IP address (127.0.0.1), because postfix might not
be able to resolve "localhost" even though it is defined in /et
