戴帽子压头发:大家能告诉我为什么邮件发不出去吗

我有一个德国的朋友,他把他的邮箱地址给了我,可是我发不出去,老是系统退信,很奇怪,这个地址不是中国的,最末尾是.de 不知道是不是网络的问题，请大家帮我解决一下这个问题，谢谢．

This message is generated by COREMAIL email system.
I'm sorry to have to inform you that the message returned

你发送到p-behrend@f-online.de的邮件由于以下原因被退回：p-behrend@f-online.de SMTP error, RCPT TO: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

如果您对此有疑问,请联系网易公司客服部门(全国唯一24小时客户服务)，并将退信全文转发至客服信箱：kf126@188.com

这是他给我的系统退信，大家能帮我分析一下其中的原因吗，如果我把．de 改成．com 可以吗

有一个网友告诉我说我的邮箱不支持这种服务，我可以换一个邮箱，比如 yahoo的，它那个一般都支持，或者换gmail的，这些都是国际通用的
不过我后来试了yahoo的，还是发不出去，系统退信如下：

Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<p-behrend@f-online.de>:
213.133.115.130 does not like recipient.
Remote host said: 553 sorry, that domain isn't in my list of allowed
rcpthosts (#5.7.1)
Giving up on 213.133.115.130.

--- Below this line is a copy of the message.

Return-Path: <luojie891109@yahoo.com.cn>
Received: (qmail 87251 invoked by uid 60001); 5 Aug 2006 08:17:37 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com.cn;

h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding;

b=vQX8B4v7atXMj3i4H38KELptSX+X5GpH4oCFvywAjHK3AtFkPrXYz3CYuedD5+qOdPr0AKJxFnBo2lCuXpNj3xfxCifsRyR3zMeeIiN9KUu7F5NdlfDRaSCrEzjeWO5r528vyPNyuLLNUnRzTWZxxjGh+cfkf/nZi5O8DosgeJk=
;
Message-ID: <20060805081737.87249.qmail@web15304.mail.cnb.yahoo.com>
Received: from [221.236.63.137] by web15304.mail.cnb.yahoo.com via
HTTP; Sat, 05 Aug 2006 16:17:37 CST
Date: Sat, 5 Aug 2006 16:17:37 +0800 (CST)
From: Jie Luo <luojie891109@yahoo.com.cn>
Subject: To Peter
To: p-behrend@f-online.de
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="0-1729407334-1154765857=:83825"
Content-Transfer-Encoding: 8bit

--0-1729407334-1154765857=:83825
Content-Type: text/plain; charset=gb2312
Content-Transfer-Encoding: 8bit
真的很恼火啊，不知道为什么会这样，应该不是邮箱地址的错误啊，大家帮帮我吧，这个朋友很重要，这是他唯一的联系方式，谢谢大家了．