Mail sent from script not delivered to some addresses

For some target email addresses, the mail sent from an asp.net script on the web site does not reach (probably stopped by dspam). Symptoms:

1) I verified by sending mal through script to many of my email addresses. On one of the addresses, I found this problem.

2) Then, I sent the same mail to that address through the same smtp server that the script uses but from my PC. This time it reached.

What is the difference here if the same SMTP server is used? How can I make sending from the script more reliable? Or do you need to do something. I read somewhere in these forums about adding SPF. Will it solve this problem? What does it mean and where are the details?

Thanks,
Sanjay
 
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