Postfix Debugger

This how to activate postfix debugger on my centos 5.2

in main.cf

debugger_command =
         PATH=/bin:/usr/bin:/usr/local/bin;
         (strace -p $process_id 2>&1 | logger -p mail.info) & sleep 5

in master.cf

smtp      inet  n       -       n       -        -       smtpd     -D

# postfix reload

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