Sorry for the debug, I've think (bad think) that can help for find the reason.
That is for example my dunno.pl script: http://pastebin.com/cCQp1Few It's hard to understand why this perl script need more than 3600 sec... It must just reply "dunno" at postfix when they call the perl script ... And on the log I've Jul 8 17:29:05 mx02 postfix/spawn[1822]: warning: /etc/postfix/policy/dunno.pl: process id 25327: command time limit exceeded Jul 8 17:29:44 mx02 postfix/spawn[1333]: warning: /etc/postfix/policy/dunno.pl: process id 25565: command time limit exceeded Jul 8 17:30:33 mx02 postfix/spawn[2785]: warning: /etc/postfix/policy/dunno.pl: process id 25905: command time limit exceeded On the main.cf I've really apply that: dunnopl_time_limit = 3600 I've reboot the server ... But ... with 3600 ... this "basic" reply need more thant 3600 sec. ... I can't understand ... Again thank for all. Damien