Implement a reset inside __clone method to avoid headers duplication #40
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In Cake4, Mailer class clone transport before executing deliver method, then it restores the transport instance. When MailgunTransport is clone, the FormData instance in _formData property is shared between the two instances (original and clone) so even when _reset is called after sending email, the cloned instance keeps the previous _formData generating emails with multiple to, subject and from headers.
Calling _reset in new instance fixes the issue