垃圾信之威脅

檔垃圾信的確是一門學問
除了基本防治RELAY外～
對於本機的好像還是比較難防治

以hinet為例～
hinet的信箱為msa.hinet.net

#telnet msa.hinet.net 25
Trying 168.95.4.211...
Connected to msa.hinet.net (168.95.4.211).
Escape character is '^]'.
220 msr30.hinet.net ESMTP Sendmail V8; Mon, 16 Jan 2006 16:05:06 +0800 (CST)
HELO localhost
250 msr45.hinet.net Hello XXX-XXX-XXX-XXX.HINET-IP.hinet.net [XXX-XXX-XXX-XXX]
, pleased to meet you
MAIL FROM:<"[email protected]">
250 <"[email protected]">... Sender ok
RCPT TO:<"[email protected]">
250 <"[email protected]">... Recipient ok
354 Enter mail, end with "." on a line by itself
DATA
354 Enter mail, end with "." on a line by itself
Return-Path:
X-Original-To: [email protected]
Delivered-To: [email protected]
Received: from services (unknown [192.168.1.1])
by msa.hinet.net (Postfix) with ESMTP id 903F12F8093
for ; Mon, 16 Jan 2006 16:28:18 +0800 (CST)
Reply-To: [email protected]
From: "=?big5?B?SElORVSodLLOpL2naQ==?="
To: "services"
Subject: =?big5?B?SElORVStq61upL2naaFJs3Ss3aFJ?=
Date: Mon, 16 Jan 2006 16:28:45 +0800
Message-Id:
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_06011616284457482786022_002"
X-Priority: 3
X-Mailer: HINET
Status:

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.
250 QAA04843 Message accepted for delivery

恩～測試結束了^^

快去看看有沒收到囉～
我是成功收到囉～
所以寄發垃圾信不難～
若配合程式執行～隨機的發信的確不錯
只是當然你實際上得ip還是會被紀錄
所以要用浮動ip唷^^

但是這裡不是要告訴大家怎寄垃圾信啦～
只是我覺得垃圾信還真的很難防
就算沒有open relay還是可以輕易的寄送垃圾信
所以我覺得主機還是得注意這個部份
不能說沒有人想用大量垃圾郵件塞爆你
因此quota還是得作設定

此外hinet雖然是垃圾信集中營
但是也提供你煮的主機測是否能open relay的工具
http://lcss.hinet.net/antispam/or_check.pl
結果令人歡喜～但是訊息又有點錯愕
如下：
您目前電腦使用的 IP 位址為： xxx.xxx.xxx.xxx
測試結果：非常好，您的電腦應該不會被當成廣告信跳板(測試結果僅供參考)
哈哈～就是這樣..

總結～client端自己檔信吧～