What type of headers have to be added in the mail function to attach a file?
A lot. And unless you want to properly learn them, I'd strongly suggest using a third party script like PHPMailer.
I wouldnt use PHP's built-in mail function since its kinda primitive and wont really handle complex email requests. Look for email libraries from PEAR may be your best shot to find a solution to your problem.
I used PHPMailer, and I think it is very easy and most reliable to use.
You just try and check.
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