hubot@hubot-vps:~$ sudo dig MX hubot.pl +short @dns1.forpsicloud.cz
20 mail.hubot.pl.
hubot@hubot-vps:~$ sudo host mail.hubot.pl dns1.forpsicloud.cz
Using domain server:
Name: dns1.forpsicloud.cz
Address: 81.2.232.15#53
Aliases: 

mail.hubot.pl has address 81.2.239.96