Following is the error I am getting when I try to send a newsletter email to a subscriber.

The error occurred in: http://localhost/ThePhile/Modules/Li...aspx?ListID=17
Error Message: Could not access 'CDO.Message' object.

Stack Trace:
System.Web.HttpException: Could not access 'CDO.Message' object. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Runtime.InteropServices.COMException (0x80040220): The "SendUsing" configuration value is invalid. --- End of inner exception stack trace --- at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParameters) at System.Web.Mail.LateBoundAccessHelper.CallMethod(O bject obj, String methodName, Object[] args) --- End of inner exception stack trace --- at System.Web.Mail.LateBoundAccessHelper.CallMethod(O bject obj, String methodName, Object[] args) at System.Web.Mail.CdoSysHelper.Send(MailMessage message) at System.Web.Mail.SmtpMail.Send(MailMessage message) at Wrox.WebModules.MailingLists.Business.Newsletter.S end(Int32 newsletterListID, String newsletterSubject, String newsletterBody, Boolean newsletterIsHTML, MailPriority priority, Boolean saveToDB, Int32& totalNewsletters) at Wrox.WebModules.MailingLists.Business.List.SendNew sletter(String subject, String body, Boolean isHTML, MailPriority priority, Boolean saveToDB, Int32& totalNewsletters) at Wrox.WebModules.MailingLists.Web.SendNewsletter.Se nd_Click(Object sender, EventArgs e) in C:\wrox\ThePhile\Modules\Lists\Admin\SendNewslette r.aspx.cs:line 101 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.System.Web.UI.IPo stBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEve ntHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCol lection postData) at System.Web.UI.Page.ProcessRequestMain()

The subscribe and unsubcribe methods are set to the default smtp settings.

Just change the static property to reflect your SMTP server.

For example:

This is what I use for testing. I'm using my static ISP's smtp server.

Smtp.mail.smtpserver = smtp.cox.west.net
smtp.send(mailMsg)

Note: There are a few places you must make the changes. The MailingList.Business classes (Newsletter.vb and Subcription.vb)

I made these changes about 9 months ago.

Tip: I placed all of my global setting in the web.config

<add key="smtpserver" value="cox.smtp.west.net" />
<add key="siteadmin" value="[email protected]" />

I found the simplest way to solve this problem - smtp.com. They are the oldest company, their service cost not much, they have professianal support staff. Since I've subscribed with them I haven't experienced any problems with sending email or they were resolved fast. I recommend you http://smtp.com