不稱之哀
Tom Sawyer
When we look hard enough, we can find ourselves symptomatic of what Tom Sawyer had demonstrated as a professional trickster. This condition is highly contagious, I guarantee, and not easily reversed.
It's all very well for those of us who make mistakes now and then, like what Tom Sawyer did most of the time. And it's nice
一念
got video too...
無言感激
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
溫柔不爭
嗱嗱嗱....仲影妳唔到
嗱嗱嗱....仲影妳唔到，
又o黎偷襲我。
