Well, i have my droplet with ubuntu and Nginx, and now, im trying to know and learn how to configure emails address or how to configure email server to get my email addresses like:

info@xxoqroo.com
admin@xxoqroo.com
sales@xxoqroo.com

And get inbox and all the features.... or just to get those mails configured in Thunderbird....

Any Help?
I need to install Postfix? or what i need to do, please some help