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Exchange 2007 relay

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?

Thanks.

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MarkMichael

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adembo

ASKER

So would I then have to add an accepted domain for every other domain that I wanted to have the machines be able to email to? My concern is that I dont want every computer/device on my LAN now able to relay to the remote "accepted domains", which if I understand you correctly, that is the case.

Thanks.

adembo

ASKER

I see that anonymous users are seleted on the permissions tab of the receive connector, but what happens if I unselect that? Then how would I allow individual devices to be able to do this?

jasonwebb2006

If you disable anonomous users from the recieve connectors, you will no longer recieve email coming in from the internet.