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Hi @info1681965606fde6e64f59ad
Depending on your account status with DigitalOcean, there might be a mail send-out block to prevent spam. You can contact Support via control panel to get it removed.
There’s currently no tutorial for Sendmail on Ubuntu, but you can have a look at this: https://holarails.wordpress.com/2013/11/17/configure-sendmail-in-ubuntu-12-04-and-make-it-fast/
I would recommend that you use Postfix, which is a drop-in-replacement for Sendmail: https://www.digitalocean.com/community/tutorials?q=postfix&primary_filter=popular