When I was developing my windows app and specified the SMTP server in code I would get the 'Cannot access CDO message objet'. I found some online docs that said to use the smart host property in IIS SMTP virtual server. My app worked fine and still does for all users except one. Now that user is getting "the 'Send Using' Configuration value is invalid" exception. Have you heard of other resons for this exception being thrown and how to handle it? Thanks!

meghan [ kellym_33 ( at ) hotmail dot com ], 2004-03-25 10:16:53 #

I ran into the same thing you did. I tried setting the configuration properties, and got the error you did. If I removed the configuration stuff, I went back to the original "SendUsing" configuration value error.

Luckily, I stumbled upon a fix. I was moving a site from one Win2k3 server to another. It worked on the old one, but wasn't working on the new one. After comparing the SMTP settings between the two, I found a difference. When I set them up identically, the problem went away, without needing the configuration code.

Here's what I did:

* Go to the Internet Information Services manager, and right-click on Default SMTP Virtual Server; select Properties. This will give you a pop-up titled "Default SMTP Virtual Server Properties."
* Go to the Security tab, and look at the list of operators. My working configuration has three entries:

- Administrators (the machine's local group)
- NT AUTHORITY\LOCAL SERVICE
- NT AUTHORITY\NETWORK SERVICE

If you don't have those last two lines, you will continue to get the error, regardless of what you do programmatically.

To add the last two:
* Hit the Add button; you will get a pop-up titled "Select Users or Groups."
* Hit the Object Types button; you will get a pop-up titled "Object Types." Make sure Users, Groups and Security Principals are checked, then hit OK. This takes you back to the "Select Users or Groups" pop-up.
* Hit the Locations button; this will give you a pop-up titled "Locations." Select the machine name (not a domain) from the list, then hit OK. This will take you back to "Select Users or Groups."
* Hit the Advanced button; this will bring up another, larger pop-up titled "Select Users or Groups."
* In this new pop-up window, hit Find Now. It will show you a complete list of users, groups and internal security principals for the machine
* Select LOCAL SERVICE and NETWORK SERVICE, then hit OK
* You're back to the smaller "Select Users or Groups" pop-up. You should see LOCAL SERVICE and NETWORK SERVICE in the box. Hit OK
* You're now back to the "Default SMTP Virtual Server Properties" window. You should now have all the necessary groups listed.

After doing this, I was able to get ASP to send e-mail from that server, without needing to mess with any SmtpMail.* stuff, at all.

Tony [ tmchesser ( at ) yahoo dot com ], 2004-08-11 07:51:52 #

Step 1
Use SmtpMail.SmtpServer = "localhost" in your code to get rid of This error: The "SendUsing" configuration value is invalid.

Step 2
Run inetmgr, then right click on "Default SMTP Virtual Server", then choose the Tab "Access", then click on "Relay..." button from "Relay restrictions", then choose "All except the list below" radio button and click OK.
This will get rid of the relay error.

Have to follow both Step 1 and Step 2.

Thanks for all the help from this website and replies from everybody

Fai [ faiboy1 ( at ) hotmail dot com ], 2004-12-08 01:08:03 #

send email in asp.but create the error.please help me.
CDO.Message.1 (0x80040220)
The "SendUsing" configuration value is invalid.

Nites [ tnitesh28 ( at ) gmail dot com ], 2008-03-14 08:43:40 #