I ve a webserver allowed to send mails message (with PHP) to a postfix relay,
which send it to recipients.
I'd want that the return-path be the same that the From sender.
You do this in PHP, PHP creates the email that postfix relays. Its done with
the -f command line arg.
$to = "u...@example.com";
$from = "f...@example.com";
$subject = "Email Subject";
$headers = ['From' => $from];
$cmdLineParams = "-f $from";
$body = "Body text line one.\nAnd line two.\n";
mail($to, $subject, $body, $headers, $cmdLineParams);
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