Could not access 'CDO.Message' object

Our production web server hosts several web sites that send mail all using the same code.. on some of these sites the mail is sent successfully however others give the following message:

Could not access 'CDO.Message' object

This site was sending mail ok.  The only thing I think we have changed is some new users and also re-configured the application pool.  

What could be causing this error on some of these sites ????

Thanks in advance
mkeeganAsked:
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dstanley9Connect With a Mentor Commented:
If you do not specify an SMTP server it will use the local STMP service if it is running.  If you are using an external SMTP server, it could be permissions, it could be relaying, it could be a lot of things.  The InnerException should give you more detail.

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efamiliaCommented:
Sounds like a relay issue on your smtp server. If you're using 'localhost' as your smtp, try setting the stmpserver to the actual name of the machine. Also, open the smtp properties tab on IIS and make sure you're allow to relay freely.
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dstanley9Commented:
Generally you need to look at the InnerException when you get a "Could not access 'CDO.Message' object" error.  This is the generic COM error, and the InnerException should have more detail that may pinpoint what the problem is.
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mkeeganAuthor Commented:
Today I created a test email app on the server and this worked fine.  The code is the same as the failing app.  It also uses Integration Security and the same application pool.

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim mail As New MailMessage
        mail.From = ""
        mail.To = ""
        mail.Subject = "Test Email"
        mail.Body = "This is only a test email"
        mail.BodyFormat = MailFormat.Html
        Try
            SmtpMail.Send(mail)
        Catch ex As Exception
            Label1.Text = ex.InnerException.ToString
        Finally
            Label1.Text = "email sent successfully"
        End Try

    End Sub

Notice that at this stage I am not using specifying a smtp server.  Does this matter?  Our environent is Load Balanced between 2 servers.  Each server has 2 network cards, 1 with an internal address and the other with an External Address.  Maybe this has something to do with it??  What configuration should I have in a Load Balanced environment.  

The InnerException is:

System.Web.Mail.LateBoundAccessHelper.CallMethod(Object obj, String methodName, Object[] args) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at CAT_Annuity.Global.Application_Error(Object sender, EventArgs e)

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mkeeganAuthor Commented:
I've been having a play with the swapping the Application Pool.  

An Application pool that achieves a Successful email send and receive results in the following being logged:
2006-06-16 01:34:00 1.1.1.1 OutboundConnectionCommand SMTPSVC1 SERVER1 - 25 EHLO - server1.DOG.local 0 0 4 0 93 SMTP - - - -

Where 1.1.1.1 is our exchange server and SERVER1 is the name of our server.  DOG is the name of our domain.

Then I switched the Application Pool to be the same as our failing Application and this message is logged.

Failed to send
2006-06-16 02:09:09 127.0.0.1 server1 SMTPSVC1 SERVER1 127.0.0.1 0 HELO - +server1 250 0 42 13 16 SMTP - - - -

Both are being sent from the same address.  The failing send is using the localhost to send.. why would this be?
Both Application Pools use a different w3 process.. what do I need to get this working?
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dstanley9Commented:
Are the pools running under different identities?  It could be using the mail profile of the account it's running as.  Can you specify the SMTP server in the code?  Are there any access or relay restrictions on the SMTP server on Server1?
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