An exception to the rule - with some help.
Actually, a year ago I did something completely different when I received again UCE from Oracle - I'd already tried unsubscribing so I decided to see what else I could do. I sent a note to whatever legal department I could find that I didn't appreciate being emailed for something I would never use, and was disappointed that an organisation such as Oracle would engage in this activity.
The result was, well, impressive. A lawyer in that department who seems to hate spam as much as I do took this email and went digging, and it emerged the company they were using for mailing lists was not updating its blacklist as directed by Oracle. Given the fairly panicky email I got from the provider to apologise I suspect they must have had their feet roasted.
I was kept in the loop throughout this process by the lawyer, so to me that was a plus for both their legal department and for their approach to marketing - let down by a 3rd party.
Naturally, this is a legit setup, I have no intention to do this with the BUY VIAGRA CHEAP rubbish, but sometimes it is worth just politely asking the question where you may get an answer. If you don't get an answer it's time ye olde blacklist - preferably server based.
It is worth noting that EU Data Protection laws don't just mandate asking for permission to use data for marketing (and must make that opt IN, not opt OUT), they also require companies to keep that data up to date and relevant. The child product emails in the Reg article are thus clear evidence of a company not living up to its obligations, and they can be reported and fined for this. From the client information management strategies I have seen, by far the most important omission is registering the DATE of the entry coming into the system and each element thereof.
However, what I miss in Data Protection rules is an obligation for companies to tell where they got your name from. This creates a problem - as soon as you have made the mistake of registering with a company that stated in a 6 point light grey font on a white background in a page footer that it would resell your data you're on a list that gets sold to all and sundry, and you're condemned to playing a game of whack-a-mole to identify the company that does the selling because only they have the ability to remove you..