With all the movement with DomainKeys and the updated DomainKeys Identified Mail (better known as DKIM), much has changed in the “standards” and it is difficult gathering the correct steps to do when integrating with sendmail on Fedora.

Following these simple steps, you should be able to get it configured and running with little headache. Note there are a lot of moving pieces and a misstep on one will cause failure. Check and re-check each step before moving on.

1. Install the DKIM package using yum
2. Generate the public and private keys
3. Create the DNS records
   1. Public DomainKey Selector
   2. Author Domain Signing Practices
4. Modify the configuration files
   1. Private keys
   2. Milter configuration
   3. KeyList
   4. Internal hosts
5. Start the dkim-milter service
6. Integrate with sendmail
7. Test
8. Caveats

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While doing some routine housecleaning on my MacBook Pro, I must had inadvertently removed something that caused my licensed and activated copy of Parallels 6 to stop working and request to be activated. Entering in my upgrade key in the activation window only produced a message stating it was an invalid key.

The only solution I could find was to completely uninstall my copy of Parallels 6, including all the settings, and reinstall. I requested a trial key, which I used to start the software. It then asked me to purchase, asking for a new activation key, which I entered. Because it was for an upgrade to Parallels 6, it then asked me for my Parallels 5 activation key, since the software was not installed. Fortunately I had that handy and entered it, successfully re-activating my copy of Parallels 6.

Suddenly my (at the time of purchase) high tech, A/V receiver stopped offering audio; instead it displayed “ERROR ACK” in a flashing motion (approximately one second on, one second off) in the display. A call to Marantz directed me to a “local” authorized repair shop, about 40 miles away. With a fixed price $249 bill, it would be cheaper for me to futz with it myself or buy a replacement on eBay.

I tried to reset the receiver by pressing CLEAR and DISPLAY OFF simultaneously and holding about five seconds until you can hear the relay click. Unfortunately, this just reset my settings, but did not make the error message go away. Next, I did the unthinkable – disconnect all wires from the back of the unit (with the unit powered off and unplugged). I turned on the receiver and no more error! I believe the message had to do with one of the inputs (probably digital) having an error in the communication.

I attempted to disconnect some of the digital inputs with the unit on prior to attempting this procedure with no success. If I had to do it again, I would disconnect one at a time, each time cycling the power prior to disconnecting the input.