邮件投递失败，什么原因啊？

本人的面试考题，一共三封邮件，投递返回错误，是什么原因呢，请帮分析！
From: [email protected] [mailto:[email protected]]
Sent: Monday, February 02, 2009 4:16 PM
To: [email protected]
Subject: failure notice

Hi. This is the qmail-send program at lenovots.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.

:
Connected to 195.6.159.187 but greeting failed.
Remote host said: 554 smtp2.decathlon.com I'm not going to try again; this message has been in the queue too long.

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

-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Monday, February 02, 2009 10:46 AM
To: [email protected]
Subject: failure notice

Hi. This is the qmail-send program at lenovots.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.

<***@yahoo.com>:
Connected to 66.196.82.7 but greeting failed.
Remote host said: 553 Mail from 61.148.8.202 not allowed - [] I'm not going to try again; this message has been in the queue too long.

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

Return-Path:
Received: (qmail 808 invoked by uid 89); 1 Feb 2009 01:45:55 -0000
Received: from unknown (HELO lenovo7a6dd9f1)
([email protected]@10.1.1.183)
by 0 with SMTP; 1 Feb 2009 01:45:55 -0000

发件人: [email protected] [mailto:[email protected]]
发送时间: 2009年2月2日 16:17
收件人: [email protected]
主题: failure notice

Hi. This is the qmail-send program at lenovots.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.

:
216.32.181.22 does not like recipient.
Remote host said: 550 Service unavailable; Client host [61.148.8.202]
blocked using 86.blacklist.zap; Mail From IP Banned To request removal from
this list please forward this message to [email protected]
Giving up on 216.32.181.22.

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

Return-Path:
Received: (qmail 27691 invoked by uid 89); 2 Feb 2009 08:13:21 -0000
Received: from unknown (HELO NovotsZhang)
([email protected]@222.66.83.154)
by 0 with SMTP; 2 Feb 2009 08:13:21 -0000
From: "Novots/Zhangwh"
To: "'bright.zhang'"
Cc: "'Mark'" ,
,
,
"'QA'"
Subject: Monthly Report of Jan, 2009

你的IP地址在黑名单里面，所以被对方的邮件服务器拒绝了。

邮件服务器处于忙碌的时段所致。可以将邮件保存到草稿箱换个时间再发就可以了。