Changing who it is from in mail()

I'm sending myself a 开发者_如何学Pythontext message using PHP mail() and it says FRM: username@myftpaddress.com. I'm using number@txt.att.net to send the text message. How can I change that?

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You can add additional headers to the mail function, including from:

$headers  = "From: your@email.com\n";
mail($to, $subject, $body, $headers);