Dear all: I want to prevent all machines to send outbound mail (SMTP port 25) except through our SMTP server (smtp.myprovider.com)
To do this, I need to enter the server IP, but since smtp.myprovider.com resolves to many different IPs (Round Robin DNS), I have to know ALL the IPs of the server, which is not always possible.
Because of this, I would like to enter the server's hostname, but the policy manager doesn't allow that, giving this error: "Invalid address specified for Server Address: smtp.myprovider.com"
Is there a way to create policies by server's hostname to help on this kind of situation?
I'm using the "free" Untangle, since I don't need any of the extra packages.