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Nmap scan report for dns2.trouble-free.net (66.45.228.4) Host is up (0.066s latency). rDNS record for 66.45.228.4: dns.trouble-free.net Not shown: 996 filtered tcp ports (no-response) PORT STATE SERVICE 25/tcp open smtp 53/tcp open domain 465/tcp open smtps 587/tcp open submission Nmap done: 1 IP address (1 host up) scanned in 6.15 seconds