title: PHP mail not working on Plesk
body: <p>I have been using Plesk servers for months with no problems. Then I had this issue on my first Plesk server but I could fix it with the telephone support service, now I tried to call them to fix again but they have just told me that they can't solve it because I don't have support and they don't give any kind of information.
  Php mail works only when is used with SMTP. The function <a href="http://php.net/manual/es/function.mail.php" rel="nofollow noreferrer">mail()</a> just doesn't send, no errors displayed. Any clue is helpful since I'm pretty lost.</p>