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- 網友——-新部落時代的來臨 Quote: 最后,我们都成了不同俱乐部的“网友”,看不见“公共”的存在,却肯定各自真理的终极,和部落没什么两样
- 我寫部落格,我希望被認同,但不代表我很虛榮或愛錢 Quote: 對於許多人來講,這
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
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
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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