This is a quick tutorial for setting up DomainKeys on Ubuntu (I used 6.06LTS - but should work the same on others) using dkim-filter with Postfix so emails from your domain will not constantly end up in Yahoo's spam filter.

First install dkim-filter from the respositories:

sudo apt-get install dkim-filter

Next create a location for storing the public and private keys required:

sudo mkdir /var/dkim-filter

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