/dev/rob0 Need to secure up server. But want to use qmail sending and php mx functions

[<darren@xxxxxxxxxxx>]

I want to allow the qmail to send mail out from the box and allow php
scripts to use the MX functions to identify bad domains. The problem is that
this means I need to have all ports open for outgoing . Is there a way to
set up for outgoing mail and mx record checks to be done without opening all
ports.