For class I have to make a "newsletter signup form". It didn't actually have to send an e-mail, but the bonus was to make it send an e-mail if the person submitted a form to remove themselves from the database. I am not really sure how to hook it up to the UniServer SMTP or anything, nor do I know how to hook it up to any other mail server. The code I have for now is:

$to = $email;
$subject = "You left!";
$body = "You have successfully removed yourself from our database, you treacherous scum.";
if (mail($to, $subject, $body)) {
  echo("An e-mail has been sent confirming your removal from our database.");
 } else {
  echo("<em>failure sending e-mail</em>");
 }

The e-mail variable is defined earlier in the script. It is retrieved from the database.

The following Wiki page will help you:

http://wiki.uniformserver.com/index.php/5.3-Nano:_msmtp

Covers Uniform Server configuration and example PHP script for sending e-mails.