When mail() sends, via sendmail,  an e-mail to an invalid address, it's 
returned to the "envelope-sender" (e.g.: the ISP), NOT returned to the 
"from" address, or the "return-path" address, etc. that are included with 
mail()'s 4th parameter.

I'm planning to write a "modified" mail() to include the "true" 
return-path. In order to do so, I need to communicate directly with 
sendmail  and, in my newbie's opinion,  a good start would be to review the 
source code of the mail().

Where can I find it?

Thank you!

Anthony F. Rodriguez

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