Yesterday I had a customer sending me emails from a different account from last time. That different account is a Yahoo! account so in general there is no problems with that.

Yet, this one time it did not make it. One of my email filters failed. Namely, the DKIM filter. It uses the dkim library to check mail messages and make sure that they indeed originate from where they say they are from.

It is an interesting concept. In the following figure I show the standard scenario of a hacker sending me spam and a valid domain sending me an email:

Copying an entire partition to another when both are not of the exact same size (in blocks) can be tricky, especially if that partition includes special files such as /dev/hda and FIFOs.1

Yet, there are several ways to do so:

• 1. Note that was the case especially in the 90's. As of today, things have come a long way and there are command line options one can use with the cp and tar instructions to copy pretty much anything. You will still have problems with some files such as locks, though. But you should not have to copy them!

Well... I knew that a firewall could generate a few problems, but this one, I did not expect!

I just could not FTP anything from my FedoraCore box. I checked the source system firewall, tweaked all sorts of options in the vsftpd.conf file to no aval.

The error I was getting was this:

Moving a website to a new server

Now and again, you have to move a website from one server to another.

There are good and bad things about that, the main problem is with dynamic websites. Why is that? Simple: a dynamic website expects to access a database and if you hit the wrong server, that will go bad.

What's the best solution?