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: ------=_NextPart_06011616284457482786022_002 Content-Type: text/plain;   charset="big5" Content-Transfer-Encoding: base64 SElORVSkXaxPpWmlSLCyqrqt8qFJDQqko7dcrE+lQKzJssSkQKlVp6OrSMLgsUikaq+4oUkNCg== ------=_NextPart_06011616284457482786022_002 Content-Type: text/html;   charset="big5" Content-Transfer-Encoding: base64 PEhUTUw+PEhFQUQ+PFRJVExFPk1haWw8L1RJVExFPg0KPE 1FVEEgY29udGVudD0iS3NESFRNTEVE TGliLm9jeCwgRnJlZVdhcmUgSFRNTCBFZGl0b3IgMS4xNjQuM SwgP0t1cnQgU2VuZmVyIiANCm5h bWU9R0VORVJBVE9SPg0KPE1FVEEgaHR0cC1lcXVpdj1Db25 0ZW50LVR5cGUgY29udGVudD0idGV4 dC9odG1sOyBjaGFyc2V0PWJpZzUiPjwvSEVBRD4NCjxCT0RZI HN0eWxlPSJGT05ULVNJWkU6IDlw dDsgRk9OVC1GQU1JTFk6ILLTqfrF6SIgbGVmdE1hcmdpbj01I HRvcE1hcmdpbj01ICNmZmZmZmY+ DQo8RElWPkhJTkVUpF2sT6VppUiwsqq6rfKhSTwvRElWPg0K PERJVj6ko7dcrE+lQKzJssSkQKlV p6OrSMLgsUikaq+4oUk8IS0tQUlEX1NFTkRUT19CRUdJTi0tP jwvRElWPjwvQk9EWT48L0hUTUw+ DQo= ------=_NextPart_06011616284457482786022_002-- . 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～