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" Adding functionality is not just a matter of adding code. "

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" Like all software, Qmail can survive only when it keeps up with changing requirements. "

" Windows favors multi-threading, which means that a service is implemented by one single process. "

" For many people my software is something that you install and forget. I like to keep it that way. "

" The challenge with Postfix, or with any piece of software, is to update software without introducing problems. "

" However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions. "

" In a previous life I wrote the software that controlled my physics experiments. That software had to deal with all kinds of possible failures in equipment. That is probably where I learned to rely on multiple safety nets inside and around my systems. "

" One bug in an SMTP server can open up the whole machine for intrusion. "

" Defect-free software does not exist. "

" Postfix keeps running even if one Postfix process dies; Windows requires that someone restarts the service. "

" My reply is: the software has no known bugs, therefore it has not been updated. "

" Lack of documentation is becoming a problem for acceptance. "

" This will surprise some of your readers, but my primary interest is not with computer security. I am primarily interested in writing software that works as intended. "

" I was going to visit IBM for six months as a visiting scientist. Now, six months is a lot of time, so I came with a whole list of projects that I might want to work on. "

" Most of the effort in the software business goes into the maintenance of code that already exists. "

" Coming back to the topic of computer security, the TCP Wrapper is an example of such a safety net. I wrote it when my systems were under attack by someone who appeared to walk through walls. "

" I don't expect an overnight change of all desktops to what the US Military used to call B3 level security. And even that would not stop users from shooting themselves into the foot. "

" As of today, the Postfix mail transport agent has almost 50,000 lines of code, comments not included. "

" The Postfix security model is based on keeping software simple and stupid. "

" Writing software that's safe even in the presence of bugs makes the challenge even more interesting. "

" I want to avoid locking people into solutions that work only with Postfix. People should have a choice in what software they want to use with Postfix, be it anti-virus or otherwise. "

" At the time the Sendmail program had a very poor reputation with respect to security, with four root vulnerabilities per year for two successive years. "

" When I write software, I know that it will fail, either due to my own mistake, or due to some other cause. "