How to reject at SMTP time without enabling dictionary scanning

One claimed problem with rejecting unknown local addresses at SMTPtime is that it enables a spammer to do a cheap dictionary scan ofyour domain to find valid usernames; all they have to do is try abunch of RCPT TO s and see which ones get accepted (or don't get apermanent failure). The easiest way around this is simple: just do yourgreylisting before you give permanent rejections.

This doesn't completely block dictionary scanning (or other versions ofaddress scanning), but it does force


Why SMTP needs a way of communicating partial success for message delivery

As illustrated in yesterday's entry , one of the problems of the (E)SMTPprotocol is that after a SMTP server has accepted all of the message'sdestination addresses and gets to see the actual message, it has noway to tell the client that the message was delivered to only some ofthose addresses. This decision made perfect sense at the time thatSMTP and then ESMTP were being created, because back then most of theplausible per-address problems could be detected at RCPT TO timeand if


20080903 網摘 – Google 瀏覽器

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Chrome 初試

不寫詳文,只懶鬼地點列:

  • 超快、穩定
  • 介面簡潔,也有不錯的動畫效果
  • 常看的網站 Rendering 大致沒有問題 (不過我去的大多是外國網站)
  • Shortcut 跟 Firefox 差不多
  • JS Panel 和 Inspector 不錯
  • Tab 首頁感覺良好,但如果可真的如 Opera speed-dial 就更方便
  • 其實 Memory 並不用少很

漫畫化的技術文件

打此篇時 Google Chrome 還未推出,但經過這一天的蘊釀,現在已可算是萬眾期待吧?

這次 Google 明開生面地使用 漫畫 介紹這個新的瀏覽器的架構、功能等等。但別以為漫畫容易入口,因為裏面的內容絕對是 highly technical。

在介紹其 Multi-Process Architecture 時,漫畫說


溫柔不爭

梁國雄現在個朵叫大長毛,但我有天在地鐵站外遇到他,他在派傳單,真是隻身。其實我有見過非常和善甚至可稱溫厚的長毛,比如下面這個片斷,面對著沒好氣像後母一樣的主席,長毛真是有理說不清,像一個一心想做好事卻

嗱嗱嗱....仲影妳唔到













嗱嗱嗱....仲影妳唔到,
又o黎偷襲我。

唔係貓就係狗















獨留子女在天台,情況如下。


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又一年


又一年了
老了就會有很多感想
老了就會對很多事情沒有感覺
老了
也會希望自己不那麼幼稚

又一年了
不容易過的一年
不過又捱過了

最近都有很多事情要想
不過真的不想多想時
也唯有讀書
不知是什麼原因
我最近都在讀經
馮象重新翻譯

in Okinawa!

沒有女人會穿的T Shirt....in Okinawa, Japan.

原來從香港到沖繩只需兩個小時。
















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趙碩之吸引攝影發燒友 袁彌明低胸搶風頭