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Is it possible to trace the From: header in the PHP mail() function? Meaning if I sent it as, say, noreply@google.com from a server on example.com, could it be traced back to example.com?
If you’re trying to debug something you’ve written & you know you’re not trying to break the headers, yes. If you’re trying to track down the source of some spam, OTOH, you should assume that the headers contain incorrect information.