ldap-user-manager/www/includes/mail_functions.inc.php

<?php

require_once "/opt/PHPMailer/src/PHPMailer.php";
require_once "/opt/PHPMailer/src/SMTP.php";
require_once "/opt/PHPMailer/src/Exception.php";

function send_email($recipient_email,$recipient_name,$subject,$body) {

  global $EMAIL, $SMTP, $log_prefix;

  $mail = new PHPMailer\PHPMailer\PHPMailer();
  $mail->isSMTP();

  $mail->SMTPDebug = $SMTP['debug_level'];
  $mail->Debugoutput = function($message, $level) { error_log("$log_prefix SMTP (level $level): $message"); };

  $mail->Host = $SMTP['host'];
  $mail->Port = $SMTP['port'];

  if (isset($SMTP['user'])) {
    $mail->SMTPAuth = true;
    $mail->Username = $SMTP['user'];
    $mail->Password = $SMTP['pass'];
  }

  if ($EMAIL['tls'] == TRUE) { $mail->SMTPSecure = "tls"; }

  $mail->setFrom($EMAIL['from_address'], $EMAIL['from_name']);
  $mail->addAddress($recipient_email, $recipient_name);
  $mail->Subject = $subject;
  $mail->Body = $body;

  if (!$mail->Send())  {
    error_log("$log_prefix SMTP: Unable to send email: " . $mail->ErrorInfo);
    return FALSE;
  }
  else {
    error_log("$log_prefix SMTP: sent an email to $recipient_email ($recipient_name)");
    return TRUE;
  }

}

?>