I looked through the forums and found a few references to whitelisting techniques using the Postfix and Spamassassin configuration files, but I have yet to find a definitive answer or howto on what needs to be done to whitelist my entire network and any SMTP AUTH authenticated senders to ensure their emails never end up in the Junk folder. We have notifications being sent to customers from our webserver and it is getting labeled as [spam].

Anyone have any suggestions or additional resources I need to review?