system/library/mail/smtp.php

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<?php
namespace Mail;
class Smtp {
	public $smtp_hostname;
	public $smtp_username;
	public $smtp_password;
	public $smtp_port = 25;
	public $smtp_timeout = 5;
	public $max_attempts = 5;
	public $verp = false;

	public function send() {
		if (is_array($this->to)) {
			$to = implode(',', $this->to);
		} else {
			$to = $this->to;
		}

		$boundary = '----=_NextPart_' . md5(time());

		$header  = 'MIME-Version: 1.0' . PHP_EOL;
		$header .= 'To: <' . $to . '>' . PHP_EOL;
		$header .= 'Subject: =?UTF-8?B?' . base64_encode($this->subject) . '?=' . PHP_EOL;
		$header .= 'Date: ' . date('D, d M Y H:i:s O') . PHP_EOL;
		$header .= 'From: =?UTF-8?B?' . base64_encode($this->sender) . '?= <' . $this->from . '>' . PHP_EOL;

		if (!$this->reply_to) {
			$header .= 'Reply-To: =?UTF-8?B?' . base64_encode($this->sender) . '?= <' . $this->from . '>' . PHP_EOL;
		} else {
			$header .= 'Reply-To: =?UTF-8?B?' . base64_encode($this->reply_to) . '?= <' . $this->reply_to . '>' . PHP_EOL;
		}

		$header .= 'Return-Path: ' . $this->from . PHP_EOL;
		$header .= 'X-Mailer: PHP/' . phpversion() . PHP_EOL;
		$header .= 'Content-Type: multipart/mixed; boundary="' . $boundary . '"' . PHP_EOL . PHP_EOL;

		if (!$this->html) {
			$message  = '--' . $boundary . PHP_EOL;
			$message .= 'Content-Type: text/plain; charset="utf-8"' . PHP_EOL;
			$message .= 'Content-Transfer-Encoding: 8bit' . PHP_EOL . PHP_EOL;
			$message .= $this->text . PHP_EOL;
		} else {
			$message  = '--' . $boundary . PHP_EOL;
			$message .= 'Content-Type: multipart/alternative; boundary="' . $boundary . '_alt"' . PHP_EOL . PHP_EOL;
			$message .= '--' . $boundary . '_alt' . PHP_EOL;
			$message .= 'Content-Type: text/plain; charset="utf-8"' . PHP_EOL;
			$message .= 'Content-Transfer-Encoding: 8bit' . PHP_EOL . PHP_EOL;

			if ($this->text) {
				$message .= $this->text . PHP_EOL;
			} else {
				$message .= 'This is a HTML email and your email client software does not support HTML email!' . PHP_EOL;
			}

			$message .= '--' . $boundary . '_alt' . PHP_EOL;
			$message .= 'Content-Type: text/html; charset="utf-8"' . PHP_EOL;
			$message .= 'Content-Transfer-Encoding: 8bit' . PHP_EOL . PHP_EOL;
			$message .= $this->html . PHP_EOL;
			$message .= '--' . $boundary . '_alt--' . PHP_EOL;
		}