Error 80040211 9 in 10 times

Hi,

I have recently moved an application from a windows 2000 machine (IIS5) to a windows 2008 R2 machine (IIS6). All has gone smoothly, we have some legacy applications that were using CDONTS to send email, which we've rewritten to send via CDOSYS. Below is a sample of the code:
Mail = Server.CreateObject("CDO.Message")
Mail.From = rReply
Mail.To = Addr
Mail.Subject = rName
Mail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/sendusing")=2
Mail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/smtpserver")="smtp.star.co.uk"
Mail.Configuration.Fields.Item _
("http://schemas.microsoft.com/cdo/configuration/smtpserverport")=25
Mail.Configuration.Fields.Item _
("http://schema.microsoft.com/cdo/configuration/smtpconnectiontimeout")=60
Mail.Configuration.Fields.Update
if Addr <> "" then
Mail.Send
End if
Set Mail = nothing

Now 9 in 10 times this works. The other times it generates a 80040211 error with no text. The SMTP does not require authentication and didn't require any when using CDONTS.

So what have I tried thus far:
1. Sending an email from the machine using telnet. I can access the port, send an email without any blocks.
2. Alerting the error out (if err.number <> 0 etc etc). There does not appear to be any exception to error out.
3. The elusive 1000 line limit - I've got it to insert a VBCRLF after each HTML tag

The problem is, its not reliable. We use this app for sending out bulk emails and it keeps falling over.

Any suggestions from anyone?

Thanks
J

When I've used ASP to do emailing I've usually done it this way:

<code>
Set cdoConfig = CreateObject("CDO.Configuration")
With cdoConfig.Fields
.Item(sch & "sendusing") = 2
.Item(sch & "smtpserver") = "smtp.star.co.uk"
.Item(sch & "smtpserverport") = 25
.Item(sch & "smtpauthenticate") = 0
.Update
End With

Set cdoMessage = CreateObject("CDO.Message")
With cdoMessage
Set .Configuration = cdoConfig
.From = rReply
.To = Addr
.Subject = rName
.HTMLBody = "<a>Hello World</a>"
.MimeFormatted = True
.Fields.Update
End With

If Addr <> "" Then
cdoMessage.Send
End If
Set Mail = nothing

</code>

So separating out the configuration to a different object. It's been working fine on 2008 but I've not been doing bulk emailing with this. You can leave out the MimeFormatted if you want; I've only got that for embedded images.