Email nothifications from wordpress do not work after migration on digitalocean

My server configuration includes: Ubuntu 16.04 Nginx PHP7 MySQL Exactly on wordpress I am using plugin called Caldera Forms which one is using wordpress email system for sending notifications after someone complete the web form. Can someone help me with this?

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Do you know should I configure entire server, I was planing to use other system (provider) as email platform.

you need to install a SMTP server. Try,

apt install postfix