Here's a condensed version of the run script from:

http://www-dt.e-technik.uni-dortmund.de/~ma/postfix/daemontools.html                                                               

Notes:

    - the postfix 'master' process needs to run under a process supervisor

---
#!/bin/sh -e

export PATH=$(postconf -h command_directory):$(postconf -h daemon_directory):${PATH}

master -t || postfix stop 
postfix check 
exec master  >/dev/null 2>&1
---


--
Jack (John) Cummings                           http://mudshark.org/
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