$mail_object =& Mail::factory( 'smtp', $wgSMTP );

$recipients , $headers, $body

			// Create the mail object using the Mail::factory method
			$mail_object =& Mail::factory( 'smtp', $wgSMTP );
			if ( PEAR::isError( $mail_object ) ) {
				wfDebug( "PEAR::Mail factory failed: " . $mail_object->getMessage() . "\n" );
				MediaWiki\restoreWarnings();
				return Status::newFatal( 'pear-mail-error', $mail_object->getMessage() );
			}

			wfDebug( "Sending mail via PEAR::Mail\n" );

			$headers['Subject'] = self::quotedPrintable( $subject );

			// When sending only to one recipient, shows it its email using To:
			if ( count( $to ) == 1 ) {
				$headers['To'] = $to[0]->toString();
			}

			// Split jobs since SMTP servers tends to limit the maximum
			// number of possible recipients.
			$chunks = array_chunk( $to, $wgEnotifMaxRecips );
			foreach ( $chunks as $chunk ) {
				$status = self::sendWithPear( $mail_object, $chunk, $headers, $body );

	/**
	 * Send mail using a PEAR mailer
	 *
	 * @param UserMailer $mailer
	 * @param string $dest
	 * @param string $headers
	 * @param string $body
	 *
	 * @return Status
	 */
	protected static function sendWithPear( $mailer, $dest, $headers, $body ) {
		$mailResult = $mailer->send( $dest, $headers, $body );

		// Based on the result return an error string,
		if ( PEAR::isError( $mailResult ) ) {
			wfDebug( "PEAR::Mail failed: " . $mailResult->getMessage() . "\n" );
			return Status::newFatal( 'pear-mail-error', $mailResult->getMessage() );
		} else {
			return Status::newGood();
		}
	}

	 * @param UserMailer $mailer

	 * @param Mail_smtp $mailer

/**
 * Provides an interface for generating Mail:: objects of various
 * types
 *
 * @param string $driver The kind of Mail:: object to instantiate.
 * @param array  $params The parameters to pass to the Mail:: object.
 * @return object Mail a instance of the driver class or if fails a PEAR Error
 * @access public
 */
function &factory($driver, $params = array())
{
    $driver = strtolower($driver);
    @include_once 'Mail/' . $driver . '.php';
    $class = 'Mail_' . $driver;
    if (class_exists($class)) {
        $mailer = new $class($params);
        return $mailer;
    } else {
        return PEAR::raiseError('Unable to find class for driver ' . $driver);
    }
}

array $headers - an associative array of headers. The header name is used as key and the header value as value. If you want to override the envelope sender of the email, set the Return-Path header and that value will be used instead of the value of the From: header.