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

Defect-free software does not exist.

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.

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.

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.

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.

Qmail out of the box works fine, so people will want to use it regardless of licensing restrictions, even when the software does not ship with their system software.

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

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

Sure, but competition is good for the user.

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

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

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.

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.

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

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.

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

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

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

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

Lack of documentation is becoming a problem for acceptance.

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

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.

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

Adding functionality is not just a matter of adding code.

We need to keep investing in economic and homeland security. We need to bank on the right kind of economic development. We need to embrace opportunities, but with the right kind of safeguards.

We must support initiatives that provide clear, concrete measures and milestones that our troops need for defeating the insurgency, building up Iraqi security forces, and handing over Iraq to the Iraqi people.

No matter how you cut it, this real debate on personal accounts is about the legitimacy of Social Security; it's not about the solvency of Social Security.

Conservatism has had from its inception vigorously positive, intellectually rigorous agenda and thinking. That agenda should have in my three pillars: strengthen the economy, strengthen our security, and strengthen our families.

The men and women of our armed forces played an instrumental role in the election process - securing polling sites and providing security - that allowed so many Iraqis the opportunity to vote freely for the first time ever.

First, the security and privacy of sensitive taxpayer information is absolutely essential.

It's true that the war in Iraq opened a distance in relations between part of Europe and the U.S. government, but our basic ties are stronger than that. We share democracy, free markets and a commitment to Western security. We differ on how to guarantee that security.

The lack of substantial resources and staffing along the Northern U.S. border poses a real security threat.

In addition to a timeline, I have proposed that U.S. troops be removed from front line combat positions in Iraqi cities and towns, turning over daily security patrols, interactions with citizens, and any offensive security actions to the Iraqis themselves.

Well, Mr. Speaker, if so many of these Iraqis are ready to come up and to provide the security, the police work in the country, then surely there should be no problem with putting American forces into the background instead of having them up front.

Effective use of Braille is as important to the blind as independent mobility, knowledge in the use of adaptive technology, and the core belief that equality, opportunity and security are truly possible for all people who are blind.

It's hard to exaggerate the importance of preserving the financial integrity of Social Security.

A salute from this corner to President Bush for saying he was willing to investigate raising or eliminating the cap on salaries subject to the Social Security tax.

Our nation owes a debt of gratitude to the 9/11 Commission members for their valuable service and important recommendations to improve homeland security.

And because of these programs like Medicare, Medicare prescription drugs, Social Security, we now have the healthiest and wealthiest group of senior citizens that the world has ever seen. This is a continuing commitment to that.

From protecting our natural resources to providing maritime security and national defense, the Coast Guard's duties are broad in scope, and the performance of those duties has never been more important.

For the next century, the Republicans have agreed that we will promote the dignity and future of every individual by building a free society under a limited, accountable government that protects liberty, security and prosperity for a brighter American dream.

Women would be disproportionately affected by the privatization of social security. It is one of the most important safety nets for American women in old age, or in times of disability, to insure financial income for their families.

We have a serious structural deficit problem. And it needs to be addressed. The president is trying to address it through reforms of Social Security, but the problem is there with other entitlement programs like Medicare and Medicaid.

It's strange that the newspapers don't see a connection between their false revelations about my private life and my need for seclusion and security.

Secondly, security. Both the challenges we face in the world and the responsibilities that our country has in protecting our people, are major issues. We need to do more in the context of domestic security.

I was very concerned that President Bush is still trying to frighten or scare the American people with respect to the condition of the Social Security system.

The only real security that a man can have in this world is a reserve of knowledge, experience and ability.