//mail($email, $subject, wordwrap($message), $headers);

changed to


phpmailer_send($from_email{$header_eol}, $_SESSION['user']->name, $email, "", $subject, wordwrap($message));



In the file invite.php (invitefriend plugin)

As follow


<?php

    /**
     * Elgg invite action
     *
     * @package ElggFile
     * @author Curverider Ltd
     * @copyright Curverider Ltd 2008-2010
     * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
     * @link http://elgg.org/
     */

    global $CONFIG;

    gatekeeper();

    $emails = get_input('emails');
    $emailmessage = get_input('emailmessage');

    $emails = trim($emails);
    if (strlen($emails) > 0) {
        $emails = preg_split('/\\s+/', $emails, -1, PREG_SPLIT_NO_EMPTY);
    }

    if (!is_array($emails) || count($emails) == 0) {
        register_error(elgg_echo('invitefriends:failure'));
        forward($_SERVER['HTTP_REFERER']);
    }

    $error = FALSE;
    $bad_emails = array();
    foreach($emails as $email) {

        $email = trim($email);
        if (empty($email)) {
            continue;
        }

        // send out other email addresses
        if (!is_email_address($email)) {
            $error = TRUE;
            $bad_emails[] = $email;
            continue;
        }

        $link = $CONFIG->wwwroot . 'pg/register?friend_guid=' . $_SESSION['guid'] . '&invitecode=' . generate_invite_code($_SESSION['user']->username);
        $message = sprintf(elgg_echo('invitefriends:email'),
                            $CONFIG->site->name,
                            $_SESSION['user']->name,
                            $emailmessage,
                            $link
                        );

        // **** this should be replaced by a core function for sending emails to people who are not members
        $site = get_entity($CONFIG->site_guid);
        // If there's an email address, use it - but only if its not from a user.
        if (($site) && (isset($site->email))) {
            // Has the current site got a from email address?
            $from = $site->email;
        } else if (isset($from->url))  {
            // If we have a url then try and use that.
            $breakdown = parse_url($from->url);
            $from = 'noreply@' . $breakdown['host']; // Handle anything with a url
        } else {
            // If all else fails, use the domain of the site.
            $from = 'noreply@' . get_site_domain($CONFIG->site_guid);
        }

        if (is_callable('mb_internal_encoding')) {
            mb_internal_encoding('UTF-8');
        }
        $site = get_entity($CONFIG->site_guid);
        $sitename = $site->name;
        if (is_callable('mb_encode_mimeheader')) {
            $sitename = mb_encode_mimeheader($site->name,"UTF-8", "B");
        }

        $header_eol = "\r\n";
        if ((isset($CONFIG->broken_mta)) && ($CONFIG->broken_mta)) {
            // Allow non-RFC 2822 mail headers to support some broken MTAs
            $header_eol = "\n";
        }

        $from_email = "\"$sitename\" <$from>";
        if (strtolower(substr(PHP_OS, 0 , 3)) == 'win') {
            // Windows is somewhat broken, so we use a different format from header
            $from_email = "$from";
        }

        $headers = "From: $from_email{$header_eol}"
            . "Content-Type: text/plain; charset=UTF-8; format=flowed{$header_eol}"
            . "MIME-Version: 1.0{$header_eol}"
            . "Content-Transfer-Encoding: 8bit{$header_eol}";

        $subject = sprintf(elgg_echo('invitefriends:subject'), $CONFIG->site->name);
        if (is_callable('mb_encode_mimeheader')) {
            $subject = mb_encode_mimeheader($subject,"UTF-8", "B");
        }

        // Format message
        $message = html_entity_decode($message, ENT_COMPAT, 'UTF-8'); // Decode any html entities
        $message = strip_tags($message); // Strip tags from message
        $message = preg_replace("/(\r\n|\r)/", "\n", $message); // Convert to unix line endings in body
        $message = preg_replace("/^From/", ">From", $message); // Change lines starting with From to >From
phpmailer_send($from_email{$header_eol}, $_SESSION['user']->name, $email, "", $subject, wordwrap($message));

        //mail($email, $subject, wordwrap($message), $headers);
    }

    if ($error) {
        register_error(sprintf(elgg_echo('invitefriends:email_error'), implode(', ', $bad_emails)));
    } else {
        system_message(elgg_echo('invitefriends:success'));
    }

    forward($_SERVER['HTTP_REFERER']);

?>