How do I send from multiple SMTP addresses natively within Exchange 2003

Currently we have multiple SMTP addresses setup (me@secondarydomain.com, me@xxx1.com, me@xxx2.com) within our default domain (me@defaultdomain.com).  We are able to send mail in/ out just fine using the corresponding aliases for each secondary domain.  Here's the thing, we've added a new domain and we can receive mail via the new domain (i.e. me@newdomain.com)  , but we want to do the same thing we do on the other secondary domains and send as well, but we keep getting these Undeliverables when sending from sample@newdomain.com:  'You do not have permission to send to this recipient'.

Is this a DNS issue? Is this a permission thing with in Exchange?  I've read all about these 3rd party tools, and I know ours is currently working natively within Exchange, is there something I'm missing completely?
deboematAsked:
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deboematAuthor Commented:
Ok, so this works now.  Apparently we had the POP3 account configured wrong.  Sorry to confuse you so.
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MesthaCommented:
The only way natively is multiple accounts with Send As permission set.
http://www.amset.info/exchange/twodomainsoneuser.asp

There are third party tools, such as Choose From by ivasoft.biz, but as far as Exchange is concerned all users only send from one email address, all others are just aliases for inbound email only.

However as you haven't said how you have the other domains configured and which method you use at present, further advice isn't really possible.

Simon.
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deboematAuthor Commented:
I currently do not have any Send As permissions setup and I send from two other aliases beside my primary.  In our FLZ we only have a MX record for our default domain. None of these other domains have this.  Does this help?
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deboematAuthor Commented:
The person that configured our current setup is no longer here, so this is why we are having issues adding this new one.
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MesthaCommented:
So how do you choose which address the message is sent from?
How does email for those other domains come in?

As this cannot be done natively, some other hack has been put in place, so it is a matter of finding which one it is.

Simon.
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deboematAuthor Commented:
One of two ways.  Specify the address in the from field on the message or create a POP3 account for that alias to just send mail.  Exchange will handle incoming mail because the alias is there and it will be sent to the Exchange mailbox.  Externally for incoming mail we point our MX records for these domains to our smart host/ SPAM filter and that relays the email to Exchange.  Sending mail using an alias usually works if the alias is on the current user's account.
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