So I am confused about the whole exchange 2007 relay setup. I have several devices that send email which are not authenticated to the network. First of all, why is it that all of them are able to send email without a setting. In exchange 2003 I had to add their IP address on the smtp virutal server to be allowed to relay, but in exchange 2007, I had to do nothing and they are able.
That is nice and easy of course, but that means that anything else on my LAN can also send email un-authenticated.
Now it does not work for external domains. Why is that? I had to add the external domain as an "accepted domain" before I could get it to send messages out. Is that the expected result?