To access OWA you would only need to open port 80(http), but this exposes your your server to the harshness of the internet. Also by opening up the server like this all email viewed by a user is sent in plain-text mean anyone that wishes to snoop can read any email open by the user.
The best...
What you are seeing is the new virus that devastator is speaking of.
The reason it is delivered to your users is that despite the fact you are not a relay the system still allows 'spoofed' from addresses as long as the mail is going to a valid address on your system. To prevent this you would...
What is the reason exchange gives for not being able to deliver the mail (i.e. host unreachable, domain not foundm etc). You can see the reason by highlighting a message in the queue and clicking on details.
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