Windows 2000 IIS with Virtual SMTP to 3rd Party Provider - Mail Size Limit?

Ok, we have AT&T T-1 with e-mail hosted by Network Solutions.  Receiving e-mail up to 10 Mb is not a problem however when sending e-mail over approx. 1.5 mb we get the response:

Your message did not reach some or all of the intended recipients.

      Subject:      FW: Test for 5 Mb File - actually 3 files totaling 4.63
      Sent:      8/27/2004 9:44 AM

The following recipient(s) could not be reached:

      XXX XXXXXXXXXX  (E-mail) on 8/27/2004 9:47 AM
            No transport provider was available for delivery to this recipient.

Now we have checked with AT&T and there are no blocks on line, we have checked with Network Solutions and their send limit is 5 MB, receive is 10.

There are no options for size to configure within IIS for Virtual SMTP and we are not running exchange internal.  

Any suggestions?

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intellitechsolutionsAsked:
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Computer101Commented:
PAQed, with points refunded (250)

Computer101
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Debsyl99Commented:
Hi
Hi have a look at the section Messages in this link,
http://www.microsoft.com/mind/1299/smtp2000/smtp2000.asp

Deb :))
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intellitechsolutionsAuthor Commented:
Ok but we set up the Virtual SMTP to be Remote not local.  We configured it to connect to their server.  If we set it up as local we are our own relay versus making them responsible, no?
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intellitechsolutionsAuthor Commented:
Turns out the problem was a time out error on the relay SMTP Server.  The Outlook 2000 clients were set to a short delay and stuff was timing out which was why no transport provider message was coming up.

Trying to close out this question but there is no way to close it if you don't want to award points.
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