Ubuntu 14.04 mail() dont send email

Let´s go, I have PHP5 with apache2 installed in my Ubuntu 14.04 x64 with 512MB.

Great, I have a php file inside my server that execute this code below:

$headers = “MIME-Version: 1.0” . “\r\n”; $headers .= “Content-type: text/html; charset=iso-8859-1” . “\r\n”; $headers .= "From: ". “help@mysitecom”. “\r\n”; $headers .= "Reply-To: ". “help@mysite.com”. “\r\n”; $headers .= “X-Mailer: PHP/” . phpversion(); $headers .= “X-Priority: 1” . “\r\n”;

if(mail(‘mymail@hotmail.com’, ‘hello’, ‘world’, $headers)){ echo “Status: OK”; }else{ echo “Status: False”; }

When I run I receive the following message: “Status: False”, Of course I don´t configure the mail server.

For this I use this steps:

1°: Change my hostname to “mymail.mysite.com” 2°: Check if the linux command “hostname” return “mymail.mysite.com” (Yes it returns) 3°: Install postfix “sudo apt-get install postfix”, select internet, and insert “mymail.mysite.com” inside system mail.

Great! Let´s test my php file and now I receive the message: “Status: OK”, Great! Now lets wait for my email…(5 minutes)…(1 hour)…(1 day)… NOTHING COMES TO MY HOTMAIL.

What I´m doing wrong??