I have Postfix configured to require user to first login before they can send an email. However, now have a NAS which needs to send notifications. Sadly it does not have the capability to login to the mail server. How can I make an exception it send email without logging into the mail server...
I didn't test it yet, but you might be able to override the smtp auth by adding the IP of the storage to the "mynetworks" setting in your /etc/postfix/main.cf
It's a personal preference of mine to keep IP based relay and smtp-auth on separate ports.