I am trying to use the code nslookup -q=mx gmail.com to find the mail server of gmail.com, but its not working on my Ubuntu. I have tried it in windows and it works fine. I can't find out what the issue on Ubuntu. The command nslookup gmail.com works though. Here are the responses of both commands;
Response for: nslookup gmail.com
thisisppn@thisisppn-HP-15-Notebook-PC:~$ nslookup gmail.com
Server: 127.0.1.1
Address: 127.0.1.1#53
Non-authoritative answer:
Name: gmail.com
Address: 216.58.196.5
Response for: nslookup -q=mx gmail.com
thisisppn@thisisppn-HP-15-Notebook-PC:~$ nslookup -q=mx gmail.com
;; connection timed out; no servers could be reached
After a quick chat, I noted that the DNS entries causing you to resolve your queries. Adding DNS entries to /etc/resolv.conf made me clear that it is indeed the DNS.
Ways of adding DNS entries listed below.
Create a file under /etc/resolvconf/resolv.conf.d/ as tail and add them there.
sudo nano /etc/resolvconf/resolv.conf.d/tail
and add nameserver 8.8.8.8 (or your preferred DNS). Once done, just restart the network manager with:
sudo service network-manager restart
Edit Connections -> select your network (wired/wireless) and Edit -> IPv4 Settings -> and select Automatic (DHCP) address only -> add under Additional DNS servers
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