· 7 years ago · Oct 04, 2018, 03:50 AM
1$ nslookup -q=mx gmail.com
2Server: 8.8.8.8
3Address: 8.8.8.8#53
4
5Non-authoritative answer:
6gmail.com mail exchanger = 40 alt4.gmail-smtp-in.l.google.com.
7gmail.com mail exchanger = 20 alt2.gmail-smtp-in.l.google.com.
8gmail.com mail exchanger = 30 alt3.gmail-smtp-in.l.google.com.
9gmail.com mail exchanger = 10 alt1.gmail-smtp-in.l.google.com.
10gmail.com mail exchanger = 5 gmail-smtp-in.l.google.com.
11
12Authoritative answers can be found from:
13
14$ telnet gmail-smtp-in.l.google.com. 25
15Trying 64.233.168.27...
16Trying 2607:f8b0:4003:c07::1a...
17telnet: Unable to connect to remote host: Network is unreachable