sendmail 无法发送邮件怎么解决? 提示 No address associated with hostname [Linux][PHP][elinkvps]

[iugo]

环境:
debian 6.0
Apache 2
PHP 5

情况描述:
本来相安无事, 但是发送的邮件总被当作垃圾邮件. 我想作个调整.
然后修改
/etc/mail/local-host-names
/etc/mail/sendmail.cf
/etc/hostname
/etc/resolv.conf
/etc/hosts

后来就出错了, 提示

service sendmail restart
Restarting Mail Transport Agent (MTA): sendmail
hostname: No address associated with hostname

然后我尽量修改回原来的配置, 但是无用了...

经过一些修改, 可以发送邮件了. 但是发件人域显示为 @stkfactory

Authentication-Results: hotmail.com; spf=temperror (sender IP is 117.79.148.168) smtp.mailfrom=www-data@stkfactory; dkim=none header.d=stkfactory; x-hmca=none header.id=suomahua@stkfactory
X-SID-PRA: suomahua@stkfactory
X-AUTH-Result: NONE
X-SID-Result: NONE
X-Message-Status: n:n
Received: from v153160.elinkvps.com ([117.79.148.168]) by BAY0-MC1-F40.Bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
Thu, 21 Nov 2013 23:23:25 -0800
Received: from v153160.elinkvps.com (localhost.localdomain [127.0.0.1])
by v153160.elinkvps.com (8.14.3/8.14.3/Debian-9.4) with ESMTP id rAM7NNhc001805
for <[email protected]>; Fri, 22 Nov 2013 07:23:23 GMT
Received: (from www-data@localhost)
by v153160.elinkvps.com (8.14.3/8.14.3/Submit) id rAM7NNbu001804;
Fri, 22 Nov 2013 07:23:23 GMT
To: [email protected]
X-PHP-Originating-Script: 0:class.phpmailer.php
Date: Fri, 22 Nov 2013 15:23:23 +0800
From: =?UTF-8?B?57Si546b6Iqx?= <suomahua@stkfactory>
Message-ID: <[email protected]>;
X-Priority: 3
X-Mailer: PHPMailer 5.0.2 (phpmailer.codeworxtech.com)
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/html; charset="UTF-8"
Return-Path: www-data@stkfactory
X-OriginalArrivalTime: 22 Nov 2013 07:23:26.0183 (UTC) FILETIME=[BBF21770:01CEE753]