I have read through other posts about email not being sent and none of them seem to apply to my situation.  Here is what I have:

Server Hardware: 2 Intel Xeon 2.2 Ghz CPUs
OS: Microsoft Windows 2000 SP4
OnTime: 7.0.2.7191 (machine had OnTime 2006, which was uninstalled before 2007 was installed).
Problem: Since the upgrade to 2007, no email notifications have been sent.

I have checked: 

• All three OnTime services are running
• Suppress All Notifications is NOT set

I cannot check the database to see which DLL is being referenced because the machine only has SQL Server 2005 Express Edition which has no Management Studio installed.

When I run the "Test" for email I get this:

Trying to load assembly Axosoft.Common.SmtpClient.dll...
Loaded assembly Axosoft.Common.SmtpClient.dll successfully...
Setting mail assembly properties...
Trying to create a new mail message...
Created mail message successfully...
Setting message properties...
Trying to send email...
Error trying to send email; please review your exception log.

Looking at the Exception Viewer, I see the following two exceptions recorded at the time I run the test:

Exception Details
Exception ID:  421
Date:  6/1/2007 5:36 PM
Source:  System
Target Site:  Void Send(System.Net.Mail.MailMessage)
User:  Administrator
Message:  Failure sending mail.
Stack Trace:     at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Axosoft.Common.SmtpClient.SendEmail(IMailMessage message)
Additional Info:  ExceptionManager.MachineName -- Server007|ExceptionManager.TimeStamp -- 6/1/2007 5:36:42 PM|ExceptionManager.FullName -- Axosoft.Common.ExceptionManagement, Version=7.0.2.7191, Culture=neutral, PublicKeyToken=21e2e88ee444275a|ExceptionManager.AppDomainName -- OnTime.exe|ExceptionManager.ThreadIdentity -- 1|ExceptionManager.WindowsIdentity -- DOMAIN\Administrator|
Exception Type:  SmtpException

...and...

Exception Details
Exception ID:  420
Date:  6/1/2007 5:36 PM
Source:  System
Target Site:  System.Net.Mail.LineInfo Send(System.Net.Mail.SmtpConnection, System.String)
User:  Administrator
Message:  Object reference not set to an instance of an object.
Stack Trace:     at System.Net.Mail.AuthCommand.Send(SmtpConnection conn, String message)
   at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)
   at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port)
   at System.Net.Mail.SmtpClient.GetConnection()
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
Additional Info:  ExceptionManager.MachineName -- Server007|ExceptionManager.TimeStamp -- 6/1/2007 5:36:42 PM|ExceptionManager.FullName -- Axosoft.Common.ExceptionManagement, Version=7.0.2.7191, Culture=neutral, PublicKeyToken=21e2e88ee444275a|ExceptionManager.AppDomainName -- OnTime.exe|ExceptionManager.ThreadIdentity -- 1|ExceptionManager.WindowsIdentity -- DOMAIN\Administrator|
Exception Type:  NullReferenceException

(Note: any personally identifiable information has been changed to protect the innocent).

Anyone have a clue what is going on here?

Thanks,
Dave Parker
IT SystemWorks