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Nmap scan report for mx2.a.mail.umich.edu (3.136.164.107) Host is up (0.060s latency). Other addresses for mx2.a.mail.umich.edu (not scanned): 3.137.10.108 3.20.94.70 rDNS record for 3.136.164.107: ec2-3-136-164-107.us-east-2.compute.amazonaws.com Not shown: 999 filtered tcp ports (no-response) PORT STATE SERVICE 25/tcp open smtp Nmap done: 1 IP address (1 host up) scanned in 7.81 seconds