hi, I got the same issue with Version postfix 2.3.6-1 on an amd64 machine.
There is postfix and postfix-mysql installed. A start does not return an error.. : # /etc/init.d/postfix start Starting Postfix Mail Transport Agent: postfix. BUT: # /etc/init.d/postfix stop Stopping Postfix Mail Transport Agent: postfixpostfix/postfix-script: fatal: usage: postfix start (or stop, reload, abort, flush, check, set-permissions, upgrade-configuration) failed! After sending the stop-command, postfix is still running (and working ;)) Thanks for any comments, Markus