ASP SMTP webform partially not working

We have a webpage with a contact us form.  The form is configured to send email to an internal address and a hotmail address.  The hotmail address receives the notification, but the internal address does not.  This web server is also the SMTP server.  It's not joined to our domain.  I can see a bunch of messages getting stuck in the queue folder for IIS.  I've tried to send a message through SMTP to myself, but it fails.  I'm not sure if this is an SMTP or IIS issue?  Thanks for helping.
AxISQSAsked:
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Paul MacDonaldDirector, Information SystemsCommented:
It's an SMTP issue.  Does this machine also host your e-mail accounts?  If not, is it possible your e-mail server doesn't accept mail from this machine?  Lastly, are there any error messages in the SMTP logs that can help guide you to a solution?
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AxISQSAuthor Commented:
this is just an SMTP server.  There are no mailboxes.  I can confirm SMTP is doing what it's supposed to because I can telnet on port 25 and send myself an email.  It just seems to have issue sending to internal addresses to the company.  I can't decipher the SMTP logs.
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Paul MacDonaldDirector, Information SystemsCommented:
You know THIS server can send e-mail so I'm guessing the SMTP server hosting your mailboxes isn't accepting e-mail from THIS server for some reason.  I'd look there first.
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AxISQSAuthor Commented:
It turns out the messages were not making it to Exchange.  In fact, from my webserver, i could not telnet to my default MX, but could telnet to others.  I created a rule in my firewall to allow SMTP traffic to our default MX, and the messages quickly emptied from the IIS queue.
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Paul MacDonaldDirector, Information SystemsCommented:
Good find and thanks for the points.
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