auto detect smtp server on user's pc

Hi,
I have a C++ application that will be run on my clients' destops. Before running my application, my clients are required to perform the activation process, which will cause my app to send an email back to me. I had some code in my app to send mail back to me but it only works if an smtp server is defined. I was just wondering if there is a way for me to determine my users' stmp server automatically through coding?

Thank you very much for  you help. Some coding example would be helpful.
leloc6787Asked:
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exclamationsoftConnect With a Mentor Commented:
The only way I can think of to scan for the correct port, is to go through each number until a connection is made.  
Find out what the correct port number is and ensure that the SMTP server is accessible from outside the network the server is physically on.  If you cannot reach it from outside the network, then try one of my other two suggestions.
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exclamationsoftCommented:
I have two suggestions:
  1. Launch the user's email program to send the email by shelling out with "mailto:email@domain.com".  MFC C++ code included which will create a new message with the user's defaultemail client.
     
  2. A slightly different approach that we employ with our software: send email completely through your code, using an email component, and use your own mail server.  This will eliminate the requirement for needing an SMTP server or depending on the user to have an email client installed and configured.
HINSTANCE hInstance = ShellExecute ( NULL, "open", "mailto:email@domain.com?subject=my%20subject&body=message%20body", 
   "", NULL, SW_SHOWNORMAL );

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leloc6787Author Commented:
Do you have an example for second solution? I defined my stmp server in my code but it works only if my laptop is connect to my company's network. I wasn't able to make it work from home.

Thanks
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exclamationsoftCommented:
Code from the second solution will require the use of an email component.  Choosing the right one would depend on the language you are programming in.
If this is the route you want to go, you can do an Internet search for "email component" and find one that has specific examples for that component.
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leloc6787Author Commented:
Thank you for your reply. I know my smtp server name but my app failed to connect to the server when I used it with port 25 from my home. Is there a way for me to scan what ports use with my smtp server?

Thank you.
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