I did not name my droplet s the same as my domain name

Posted April 19, 2014 1.8k views
I made a mistake and did not name my droplet s the same as my domain name. I then brought up my web server and set up DNS to my domain name. All's well with webserver. I now want to install a mail server and it says to name my droplet the same as my domain name, which will become its hostname and reverse DNS record. Can I fix this some how without starting a new droplet and reassigning the new IP to my domain name.

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2 answers
You can change the domain name of your droplet in the Settings->Rename tab.
Definitely. Edit /etc/hostname and replace the contents with your new hostname. Also edit /etc/hosts and add the following line: newhostname

Finally, run
sudo hostname -F /etc/hostname