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Emails sent using a PHP script with mail() function are sent from the domain's system user firstname.lastname@example.org address, instead of the email address specified in the PHP script.
Mail header passed to mail() function is invalid or is not set.
Edit PHP script and change/edit mail headers in order to change the sender e-mail address for emails: Refer to What is the return path/sender in PHP mail() scripts and how to change it? for the details.