On 21/1/2012 2:49 πμ, Wietse Venema wrote:

Try using strace. See http://www.postfix.org/DEBUG_README.html

Trying to help from my past experience, I add here some details on this (I used Postfix 2.8.5 on CentOS 6 64bit):

I added in /etc/postfix/main.cf:
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin;
(strace -p $process_id 2>&1 | logger -p mail.info) & sleep 5

and then in /etc/postfix/master.cf:
local unix - n n - - local -D

You may want to see: http://tech.groups.yahoo.com/group/postfix-users/message/280554

Good luck,
Nick

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