User cannot send outside of domain

User can send to anyone in domain, but sending to outside people comes back as non-deliverable.

System = Windows SBS 2003.
LVL 32
DrDamnitAsked:
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Matthew MillersCommented:
Are you using a smart host?
What is the NDR that you receive? What error code?
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IPLCommunicationCommented:
Your server has correct Internet Access correct, that is from the server you can open and view a Webpage correctly.?
I can only assume you have completed all of the Installation Tasks include the Internet Connection Wizard. ?

Has this fault just started ?
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Michael WorshamStaff Infrastructure ArchitectCommented:
It might be best to run your site through a DNS report via www.dnsstuff.com. It can check to see if something on your DNS and MX records aren't setup properly.
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DrDamnitAuthor Commented:
Here's the fun part: the problem is only with certain users.

Some of them are part of a server cluster joined together over multiple cities with a point to point VPN, and some of them are using RPC over HTTPS.

Ergo, some can resolve domain.local without issue, and the others resolve it using https & RPC.

i.e., it is not a DNS issue.

it is almost as if we had denied those users the ability to send via SMTP...but of course, we're using exchange not SMTP.
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Michael WorshamStaff Infrastructure ArchitectCommented:
Actually, Exchange uses an SMTP Virtual Adapter protocol for sending messages out.

Even though the following link is for setting up IMF on Exchange, you can use its screen shots to see if something is configured incorrectly.
http://www.petri.co.il/block_spam_with_exchange_2003.htm

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DrDamnitAuthor Commented:
Turns out...they had run out of exchange licenses. Purchased new licenses, and all the problems went away.
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