I have a problem with the mail () function is not working. Print that email was sent successfully, but it never arrives in my email.
I'm using zpanel and already installed sendmail on my cloud.
Ps.: ubuntu 12.04.4
Digital Ocean doesn't condone the use of panels. Someone may answer your question here but the community suggests that you learn about linux and how much better it is to administer your droplet that way: https://www.digitalocean.com/community/articles/an-introduction-to-linux-basics
Linux may be daunting to learn about at first, but familiarising yourself with the operating system is easy. The basics are simple, and you'll learn skills to arm yourself with knowledge in the future.