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> I have two identical CentOS 6 servers using
> postfix-2.6.6-2.1.el6_0.x86_64 (provided as a standard distribution
> package through the repos).
To find out what system call is failing, see the strace instructions
in http://www.postfix.org/DEBUG_README.html, and compare strace results.
If the same Postfix configuraton on different systems produces
different results, then (surprise!) the difference is caused by the
systems not Postfix.