MAKE ABSOLUTELY CERTAIN THAT IT IS CLEAR, CONCISE AND NOT AMBIGUOUS.
People who read emails all day get things wrong all too often - you would not want your site to be added to a blacklist.
Some years ago, my solicitor wrote a letter instructing a bank NOT to cancel an insurance policy (she thought they might given the circumstances). They replied stating that the policy had been cancelled as requested. In other words, they read the letter and took it to mean the exact opposite of what was actually written.
I had a scraper page removed by Google once. It was a pain filing the out DMCA (filling it out & faxing) and unless the site is your one and only baby, with information unique only to you, I wouldn't bother. They're like cockroaches and you can't keep up with them once they've found you. I reported the scraper because it was my blog and it irritates me to have my personal information on someone else's site. I have reported any of the other zillions of scrapers who have stolen my affiliate sites. There isn't enough time in the day.