Problems with sending email via CDO through a remote SMTP server

I am using CDO / ASP to send email via a remote server.

In 4 out of 5 accounts it is working. Each account is using a separate mail server and username/password.

The problem account has the correct username, password, and mail server settting. I know this because using Outlook I am able to send an receive messages.

Is there a setting on the mail server of the problem account that may be preventing the proper sending of the emails?

One suggested answer was that the server isn't allowing emails to be relayed from my server:  However, since I can send through outlook, doesn't this rule that out?

From here:

1) I don't think the SMTP server requires authentication since I can send it via Outlook without it
2) A possible error
3) Unlikely
4) Unknown
5) Didn't resolve the issue

Sub TestEmailSettings2(smtp_username,smtp_password,mail_server)
 	On Error Resume Next
	Const cdoSendUsingMethod = ""
	Const cdoSendUsingPort = 2
	Const cdoSMTPServer = ""
	Const cdoSMTPServerPort = ""
	Const cdoSMTPConnectionTimeout = ""
	Const cdoSMTPAuthenticate = ""
	Const cdoBasic = 1
	Const cdoSendUserName = ""
	Const cdoSendPassword = ""
	Dim objConfig  ' As CDO.Configuration
	Dim objMessage ' As CDO.Message
	Dim Fields     ' As ADODB.Fields
	Set objConfig = Server.CreateObject("CDO.Configuration")
	Set Fields = objConfig.Fields
	With Fields
		.Item(cdoSendUsingMethod)       = cdoSendUsingPort
		.Item(cdoSMTPServer)            = smtp_mail_server
		.Item(cdoSMTPServerPort)        = 25
		.Item(cdoSMTPConnectionTimeout) = 10
		.Item(cdoSMTPAuthenticate)      = cdoBasic
		.Item(cdoSendUserName)          = smtp_username
		.Item(cdoSendPassword)          = smtp_password
	End With
	Set objMessage = Server.CreateObject("CDO.Message")
	Set objMessage.Configuration = objConfig
	With objMessage
        .To = ""
        .From = smtp_username & "<" & smtp_username & ">"
        .Subject = "Test Message: " & smtp_username
        .TextBody = "This is a test message to see if your email settings were configured properly"
	End With
	Set Fields = Nothing
	Set objMessage = Nothing
	Set objConfig = Nothing
 	If Err.Number <> 0 Then
 		Call ClearSMTPEmailSettings(djidnumber)
 		Call DisplayError("We were able to connect to the mail server. However, there appears to be a setting on your server that is preventing the proper relaying of messages. Please recheck the settings and try again or leave the settings blank.")
 	End If
End Sub

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hieloConnect With a Mentor Commented:
>>.Item(cdoSMTPServer)            = smtp_mail_server
the name of the variable in the function argument is just mail_server NOT smtp_mail_server. So, either change:
Sub TestEmailSettings2(smtp_username,smtp_password,mail_server)

Sub TestEmailSettings2(smtp_username,smtp_password,smpt_mail_server)

OR change:
.Item(cdoSMTPServer)            = smtp_mail_server

.Item(cdoSMTPServer)            = mail_server
djlurchAuthor Commented:
Here is the error: error '8004020f' which occurs on the .Send line
djlurchAuthor Commented:

Excellent catch. I never saw that. Does not resolve the issue. The calling Sub in the main page properly populated the variable on a global scope. The code is fully functional for 4 out of 5 tested accounts.  It is just one account that is causing problems.

Please note that I don't have access to the mail server for the account, only the user/pass/mail location.
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>>3) Unlikely
If you send from outlook, to tha "bad address" does it bounce?
djlurchAuthor Commented:

Re-reading 3 I see that it talks about an invalid email address. The send to and from email addresses are both valid.
>>The send to and from email addresses are both valid.
It's not limited to invalid addresses. The remote inbox may be full OR it may not be accepting emails from the specified email address perhaps because it has been "black listed" as a spammer. The point of 3 is that your script is not telling you the "REAL" reason for the rejection. That's why I am asking if it bounces when you send via outlook. Perhaps you have more details there.
djlurchAuthor Commented:

No, it doesn't bounce.

I read somewhere about email accounts requiring a POP retrieval before allowing a message to be sent. Any way to check if this is the case?
djlurchAuthor Commented:

I got an email from the mail administrator. The said "we do not allow relaying". I'm not sure I see the difference between Outlook Pop and send and the ASP CDOSYS/CDONTS component (on the backend).
>>I'm not sure I see the difference between Outlook Pop and send and the ASP CDOSYS/CDONTS component (on the backend).
If Outlook is installed in Joe's PC, then Joe is responsible for all email originating from that account and/or pc(it's traceable). On an ASP script, anybody could use your web page to generate (spam) email but chances are YOU are not the one that would be held responsible for the actual content of said spam.
djlurchAuthor Commented:
How does the web host know that it is my server and not Outlook?
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