[Bug 777868] [NEW] Postfix smtp can no longer resolve localhost - regression from maverick.

[Matthias Andree]

Public bug reported:

Binary package hint: postfix

I have a particular Postfix relay configuration where I need to forward
SMTP to an SSH tunnel, and configure a relayhost_maps (sender_dependent
actually) as [localhost]:12345.

This worked in maverick, but fails in natty. The new Postfix 2.8 release
strips RES_DEFNAMES from _res.options (the resolver flags) by default,
which triggers a resolver bug reported separately as Launchpad Bug
#777855.

Note that this is not a Postfix bug, but a bug in eglibc - I am filing
this as Postfix bug to document the issue and for possible workarounds
should an eglibc resolution not be viable.

A possible workaround, but dangerous, is to tweak Postfix's resolver
flags as in http://marc.info/?l=postfix-users&m=130459442830727&w=2 by
setting smtp_dns_resolver_options=res_defnames, but that causes false
resolver results for some. Please see the entire thread at
http://marc.info/?t=130456164100002&r=1&w=2 for a discussion.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: postfix 2.8.2-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-9.43-generic 2.6.38.4
Uname: Linux 2.6.38-9-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Thu May  5 16:04:14 2011
ProcEnviron:
 LANGUAGE=de:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: postfix
UpgradeStatus: Upgraded to natty on 2011-05-02 (3 days ago)

** Affects: postfix (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty regression-release

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https://bugs.launchpad.net/bugs/777868

Title:
  Postfix smtp can no longer resolve localhost - regression from
  maverick.