These come around from time to time, usualy trying to get you to renew via some over priced service, but this is a new one, change 123-reg to whoever your domain is registerd with, and its the same scam, there has been NO law change, and if your host allows adult content, that is not changing, if it was, the information wouldnt be leaked, you would get the message loud and clear. So if you get this email, I would do as he says and dont  tell everyone  

Dear  Doris,

I know you're an escort, that's why I contacted you.

Today when I was checking the files of our clients (I work at 123-REG), I saw your website was hosted by us.

Know that : in 10 days appear a law that afflict a severe punishment to hosting sites (like 123-REG) who host a like an escort girl websites who are in the UK, you can be 100% sure : ENTREZ remove your sites in 10 days.

I work at 123-REG, and I can tell you that your website (www.dorishornyvitch.com) will soon be deleted.

I also see that you have not been able to manage your website, your visitors are very rare so you dont have the benefit of choose the most wealthy of your clients .

I can make all this change, I can put your website in a very fast server in Egypt or Thailand, so that all people in the UK and in the world can see it without problem, and which will not be censored or removed like the other escort websites.

I can also make your sites appear in the first page of Google, which enables you to have at least 9 or 10 new clients a day (At least !!)

I help four escorts and you're the fifth.

WARING : Information regarding the removal of sites is confidential, I beg you not to tell anyone if you tell it to someone, all people know immediately that I am the source.

Michael.

(sorry for my english, i'm French)

I had to quickly email my guy at 123reg.co.uk. I use them for all my sites ( I have dog rescue ones) and he has never heard of this but was amused by it considering 123reg is a uk based site.

Oh If only everyone could get us to the front page of google like they say then I wouldnt have to put so much work in every week getting and keeping myself there