Tracing, debugging without Source code?

[ToshiBoy]

We have a software application based on VB6.0 and running MSVM6. While I am not sure, I think the application makes use of MSMAPI6.0 controls to send files from the screen to email. he problem I have with it, is that intermittently, the send to email functionality fails. This can happen for weeks and then suddenly it works again for no apparent reason. I can see the application creating the email, but Outlook (their default email app) doesn't fire up a blank email.

Since this only happens in this particular application I am trying to figure why the emailing fails. My problem is that I am not sure how I could monitor what actually happens. I don't have access to the source ro I could runa debugger. Is there a trace program that would show me what data is being send and how it is processed when this VB app sends email?

[debasisdas]

if you dont have the source code what you will debug .

[SammyB]

Note -- This is actually ToshiBoy's reply: (press Reply not Report) This originally was in the Report text, but seems to be a reply to Debasisdas

"We have supplied the application. The client has employed another company to set up the platform, the workstation. At the moment the other company is blaming our application for the "send to email" failure. I could blame them for having a bug in the OS. Unfortunately, in the end, the client wants a solution, and so do I, so I need to find out if this problem is caused by the application or by the OS not picking up the generated email."

[debasisdas]

Note -- This is actually ToshiBoy's reply.

to whom he is replying ?
that is the parent post of the thread.