Current File : //etc/postfix/header_checks

/^Content-Type:.*report-type=["']?delivery-status["']?/
    WARN Bounce to probably forged sender
/^X-Failed-Recipients:/
    DISCARD Bounce to probably forged sender
/^Subject:.*(failure.notice|(failure|mail).delivery|Delivery.(Status.Notification|failure)|(Undeliverable|undelivered|invalid)(:|.Mail|.message))/
    WARN Looks like a bounce ($1), sender probably forged