Hi sshanky,
Postfix is already installed with Webinoly and WordPress should be able to send emails.
Check your server email log: sudo log -email
Check your firewall settings and be sure port 25 is open.
Regards.
Mail command is not a native Linux feature and is not installed by default in Ubuntu, if you want to use something specific, you should install it by yourself.
sudo apt-get install mailutils
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