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Nmap scan report for mx1.oldcastle.iphmx.com (68.232.142.231) Host is up (0.011s latency). Other addresses for mx1.oldcastle.iphmx.com (not scanned): 216.71.152.236 216.71.154.96 68.232.137.186 rDNS record for 68.232.142.231: esa1.oldcastle.iphmx.com Not shown: 998 filtered tcp ports (no-response) PORT STATE SERVICE 25/tcp open smtp 587/tcp closed submission Nmap done: 1 IP address (1 host up) scanned in 4.82 seconds