Nmap scan report for mtaproxy3.free.mail.vip.bf1.yahoo.com (67.195.204.72)
Host is up (0.16s latency).
Not shown: 99 filtered tcp ports (no-response)
PORT   STATE SERVICE
25/tcp open  smtp

Nmap done: 1 IP address (1 host up) scanned in 5.73 seconds