<?php
return array(
	//'配置项'=>'配置值'
	// 邮件配置
	'SMTP'	=>	'smtp.XXX.cn',
	'MAIL_PORT'	=>	25,
	'MAIL_USER' => '[email protected]', //邮箱用户名
	'MAIL_PWD'	=> 'XXX', //发送邮箱密码或者授权码
	'MAIL_FROM' => '[email protected]',
	'MAIL_FROM_NAME' => 'dee',
);

<?php
namespace Home\Common;

class Swiftmail {
	// @param $host 邮件服务器地址
	// @param $port 端口号
	// @param $encryption_type 加密方式（例如：使用腾讯qq邮箱时此处填ssl，不加密不填写此项）
	// @param $user 用户名
	// @param $pwd 密码或授权码
	// @param $subject 邮件主题
	// @param $body 邮件内容
	// @param $from 邮件来自邮箱号
	// @param $from_name 邮件来自名称
	// @param $to 收件人邮箱
	public static function sendMail($to, $subject, $body, $encryption_type = null) {

		$host = C('SMTP');
		$port = C('MAIL_PORT'); 
		$user = C('MAIL_USER'); 
		$pwd = C('MAIL_PWD');  
		$from = C('MAIL_FROM'); 
		$from_name = C('MAIL_FROM_NAME');

		Vendor('swiftmailer.lib.swift_required');

		$transport=\Swift_SmtpTransport::newInstance($host, $port, $encryption_type)
				->setUsername($user)
				->setPassword($pwd);

		$mailer =\Swift_Mailer::newInstance($transport);
		$message=\Swift_Message::newInstance()
						->setSubject($subject)
						->setFrom(array($from=>$from_name))
						->setTo($to)
						->setContentType("text/html")
						->setBody($body);
		$mailer->protocol='smtp';
		$mailer->send($message);
	}
}

<?php
namespace Home\Controller;
use Think\Controller;
use Home\Common\Swiftmail;

class IndexController extends Controller {

    public function mail_send() {
    	$to = '[email protected]';
    	$subject = 'SwiftMail测试标题';
    	$body = '<h1>SwiftMail演示</h1>这是dee对SwiftMail的测试内容';

    	try {
    		Swiftmail::sendMail($to, $subject, $body);
				echo 'success';
			} catch(Swift_RfcComplianceException $e) {
				echo $e->getMessage();
			}
    }
}